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| 1 | Accumulation of soil organic carbon during natural restoration of desertified grassland in China's Horqin Sandy Land显示文摘China's Horqin Sandy Land,a formerly lush grassland,has experienced extensive desertification that caused considerable carbon(C) losses from the plant-soil system.Natural restoration through grazing exclusion is a widely suggested option to sequester C and to restore degraded land.In a desertified grassland,we investigated the C accumulation in the total and light fractions of the soil organic matter from 2005 to 2013 during natural restoration.To a depth of 20 cm,the light fraction organic carbon(LFOC) storage increased by 221 g C/m2(84%) and the total soil organic carbon(SOC) storage increased by 435 g C/m2(55%).The light fraction dry matter content represented a small proportion of the total soil mass(ranging from 0.74% in 2005 to 1.39% in 2013),but the proportion of total SOC storage accounted for by LFOC was remarkable(ranging from 33% to 40%).The C sequestration averaged 28 g C/(m2·a) for LFOC and 54 g C/(m2·a) for total SOC.The total SOC was strongly and significantly positively linearly related to the light fraction dry matter content and the proportions of fine sand and silt+clay.The light fraction organic matter played a major role in total SOC sequestration.Our results suggest that grazing exclusion can restore desertified grassland and has a high potential for sequestering SOC in the semiarid Horqin Sandy Land. | YuQiang LI XueYong ZHAO FengXia ZHANG Tala AWADA ShaoKun WANG HaLin ZHAO TongHui ZHANG YuLin LI | 2015 | Journal of Arid Land2015，7，3： | 21 |
| 2 | Growth and physiological responses of Agriophyllum squarrosum to sand burial stress显示文摘Agriophyllum squarrosum is an annual desert plant widely distributed on mobile and semi-mobile dunes in all the sandy deserts of China. We studied the growth and physiological properties of A. squarrosum seedlings under different sand burial depths in 2010 and 2011 at Horqin Sandy Land, Inner Mongolia to understand the ability and mechanism that A. squarrosum withstands sand burial. The results showed that A. squarrosum had a strong ability to withstand sand burial. Its survival rate, plant height and biomass increased significantly at a burial depth 25% of seedling height and decreased significantly only when the burial depth exceeded the height of the seedlings; some plants still survived even if the burial depth reached 266% of a seedling height. The malondialdehyde(MDA) content and membrane permeability of the plant did not change significantly as long as the burial depth was not greater than the seedling height; lipid peroxidation increased and cell membranes were damaged if the burial depth was increased further. When subjected to sand burial stress, superoxide dismutase(SOD) and peroxidase(POD) activities and free proline content increased in the seedlings, while the catalase(CAT) activity and soluble sugar content decreased. Sand burial did not lead to water stress. Reductions in photosynthetic area and cell membrane damage caused by sand burial may be the major mechanisms increasing mortality and inhibiting growth of the seedling. But the increases in SOD and POD activities and proline content must play a certain role in reducing sand burial damage. | Jin LI Hao QU HaLin ZHAO RuiLian ZHOU JianYing YUN ChengChen PAN | 2015 | Journal of Arid Land2015，7，1： | 5 |
| 3 | Characteristics of plant calcium fractions for 25 species in Tengger Desert显示文摘Little attention has been paid to plant calcium fractions in the desert.To address the characteristic of the calcium fractions of desert plants,we collected 25 plant species in Tengger Desert,observed the calcium crystals using an optical microscope and determined water soluble calcium,acetic acid soluble calcium,and hydrochloric acid soluble calcium.To do so,we used sequential fractionation procedures to probe the relationships among different functional groups,different growth forms,or different successional stages.The results showed that the psammophyte,the late successional plants,and the drought-resistant shrub and semi-shrub all held considerable calcium oxalate crystal compared to the grassland plants,the early successional plants,and the perennial herb.With the proceeding succession,the acetic acid soluble calcium decreased gradually,and the hydrochloric acid soluble calcium increased gradually.The perennial herb had more water soluble calcium,while shrub held greater hydrochloric acid soluble calcium.The grassland plants held more water soluble calcium,while psammophyte had greater hydrochloric acid soluble calcium.This implies that the plants that are relatively sensitive to drought hold more calcium ion,while the drought-resistance plants hold more calcium oxalate.Thus,the plant calcium components are in close relation to plant drought-resistance,and of important significance in plant physiology of the desert. | HuaCong Ci XingDong lie Rong Li Wei Wu PingPing Xue YuBao Gao HaLin Zhao | 2010 | Research in Cold and Arid Regions2010，2，2： | 3 |
| 4 | Effects of soil stoichiometry of the CaCO_3/available phosphorus ratio on plant density in Artemisia ordosica communities显示文摘In soil, CaCO3 can reduce the availability of phosphorus in arid and semi-arid regions, thereby influencing plant growth. However, the effects of soil stoichiometry of the CaCO3/available phosphorus ratio (CaCO3/AP ratio) on plant density are unknown. In this study, we examined 4 Artemisia ordosica communities located in arid and semi-arid regions, and performed a pot experiment with an orthogonal design to examine the relationships between the soil CaCO3/AP ratio and plant density. The results showed that the soil stoichiometry of the CaCO3/AP ratio had a greater effect on growth of A. ordosica than either CaCO3 or AP as single factor. The influence of the soil CaCO3/AP ratio on density of A. ordosica was related to the climatic zone and the types and/or amplitudes of increases in the soil CaCO3/AP ratio. When the soil CaCO3/AP ratio was within the same amplitude and was less than 2.5, the A. ordosica density increased in the semi-arid region, whereas the density decreased with increasing soil CaCO3/AP ratios in the arid region. In the semi-arid region, when the soil CaCO3/AP ratio was within the same amplitude and the increase in the soil CaCO3 content was greater than the increase in soil AP, the A. ordosica density increased with increasing soil CaCO3/AP ratios. This means that the relationship between the soil CaCO3/AP ratio and the A. ordosica density remained the same. In the arid region, an increase in the soil CaCO3/AP ratio as a result of increased soil CaCO3 content and decreased soil AP resulted in increased density of A. ordosica. Therefore, the relationship between soil CaCO3/AP ratios and density of A. ordosica was altered by these changes in soil chemistry. Thus, the soil stoichiometry of the CaCO3/AP ratio is an important factor affecting the density of A. ordosica in arid and semi-arid regions. | ZHAO XueLai HE XingDong XUE PingPing ZHANG Ning WU Wei LI Rong CI HuaCong XU JingJing GAO YuBao ZHAO HaLin | 2012 | Chinese Science Bulletin2012，57，5： | 2 |
| 5 | Plant distribution at the mobile dune scale and its relevance to soil properties and topographic features显示文摘 | Xiaoan Zuo Halin Zhao Xueyong Zhao Yirui Guo Yulin Li Yayong Luo | 2008 | Environmental Geology2008，，5： | 2 |
| 6 | Carbon and nitrogen mineralization in soils along a desertification gradient in the semiarid Horqin Sandy Land, Northern China显示文摘This experiment was conducted in three sites along a desertification gradient in Horqin Sandy Land, Northern China. Soils una-mended and amended with five types of plant residue in a wide range of C:N ratios from 9.9 to 82.2 were incubated for 70 days, during which C and N mineralization were measured. Along the desertification gradient from fixed sand dune to semifixed, and mobile sand dune: cumulative CO2-C produced from the unamended soils was 231.6, 193.3 and 61.9 μg/g, respectively, while net inorganic N was 22.9, 17.6 and 0.9 mg/kg. Soils amended with residues produced more CO2-C than the unamended soils across all sites. During the first 10 days, C mineralization rate of residue-amended soils decreased with the increase of C:N ratio at each site. However, the mineralization rates were poorly correlated with the C:N ratio in subsequent stage of incubation. Soils of mobile sand dune amended with higher C:N ratio (more than 32) residues produced less CO2-C than that of fixed and semifixed sand dune. NO3--N was the predominant form of inorganic N during the mineralization process in sandy soils. Carbon-to-nitrogen ratio (C:N) can be regarded as a predictor of the speed of N mineralization in sandy soil. The more C. microphylla residue with the lowest C:N ratio (9.9) added in soils, the more net inorganic N released. Our results suggest that C. microphylla residue when added to soil would potentially provide short-term plant available N and improve the soil quality in sandy land. The desertification process postponed the release of inorganic N from plant residues. | YuQiang Li HaLin Zhao TongHui Zhang YuLin Li XiaoAn Zuo | 2010 | Research in Cold and Arid Regions2010，2，1： | 2 |
| 7 | Soil propertiesand plant species in an age sequence of Caraganamicrophylla plantations in the Horqin sandy land,North China显示文摘 | SU YONGZHONG ZHAO HALIN | | 0，，： | 1 |
| 8 | Soil properties and plant species in an age sequence of Caragana microphylla plantations in the Horqin Sandy Land, north China显示文摘 | SU Yongzhong ZHAO Halin | 2003 | Ecological Engineering2003，20，： | 1 |
| 9 | Soil properties and their spatial pattern in a degraded sandy grassland under post-grazing restoration, Inner Mongolia, northem China 显示文摘 | Su Yongzhong Li Yulin Zhao Halin | 2006 | Biogecllemistry2006，79，： | 1 |
| 10 | Spatial pattern and heterogeneity of soil properties in sand dunes under grazing and restoration in Horqin Sandy Land, Northeren China显示文摘 | Zuo Xiaoan Zhao Halin Zhao Xueyong | 2008 | Soil & Tillage Research2008，99，2： | 1 |
| 11 | Spatial pattern and heterogeneity of soil properties in sand dunes under grazing and restoration in Horqin sandy land,Northern China显示文摘 | ZUO Xiaoan ZHAO Halin ZHAO Xueyong | 2008 | Soil and Tillage Research2008，99，： | 1 |
| 12 | Biological soil crust and surface soil properties in different vegeta- tion types of Horqin sand land, China显示文摘 | Zhao Halin Guo Yirui Zhou Ruilian | 2010 | Catena2010，，82： | 1 |
| 13 | Vegetation pattern variation, soil degradation and their relationship along a grassland desertification gradient in Horqin Sandy Land, northern China显示文摘 | Xiaoan Zuo Halin Zhao Xueyong Zhao Yirui Guo Jianying Yun Shaokun Wang Takafumi Miyasaka | 2009 | Environmental Geology2009，，6： | 1 |
| 14 | Soil properties and plant species in an age sequence of Caragana microphylla plantations in the Horqin Sandy Land, North China显示文摘 | Su Yongzhong Zhao Halin | 2003 | Ecological Engineering2003，20，3： | 1 |
| 15 | Carbon mineralization potential in soil of different habitats in the semiarid Horqin Sandy Land : A laboratory experiment 显示文摘 | Su Yongzhong Zhao Halin Li Yulin | 2004 | Arid land research and Management2004，18，： | 1 |
| 16 | Soil properties and plant species in an age sequence of Caragana microphylla plantations in the Horqin Sandy Land, north China 显示文摘 | Su Yongzhong Zhao Halin | 2003 | Ecological Engineering2003，20，： | 1 |
| 17 | Scale dependent effects of environmental factors on vegeta- tion pattern and composition in Horqin Sandy Land, Northern China显示文摘 | Zuo Xiaoan Zhao Xueyong Zhao Halin | 2012 | Geoderma2012，173，34： | 1 |
| 18 | Spatial heterogeneity of soil properties and vegetation-soil re- lationships following vegetation restoration of mobile dunes in Horqin Sandy Land, Northern China显示文摘 | Zuo Xiaoan Zhao Xueyong Zhao Halin | 2009 | Plant and Soil2009，318，12： | 1 |
| 19 | Bio mass energy, carbon and nitrogen stores in different habitats along a desertification gradient in the semiarid Horqin sandy land显示文摘 | Li Yuqiang Zhao Halin Zhao Xueyong | 2006 | Arid Land Research and Man- agement2006，20，1： | 1 |
| 20 | Wind erosion on field in a semiarid area of China显示文摘 | Huang Xuewen Zhao Halin :(u Bin | 1997 | Proceedings Wind Erosion: An International Symposium Manhattan1997，，： | 1 |
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