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| 1 | 华西雨屏区几种乡土树种不同物候关键时期凋落物的有机组分特征显示文摘凋落物的有机组分含量可随着植物生长节律及物候期变化而改变.以华西雨屏区喜树(Camptotheca acuminata)、枫杨(Pterocarya stenoptera)、柏木(Cupressus funebris)和柳杉(Cryptomeria fortune)为研究对象,通过定点动态收集萌芽期、展叶期、盛叶期和落叶期凋落物组成,分析其水溶性组分(Water soluble component,WSC)、有机溶性组分(Organic solvent soluble component,OSC)、酸溶性组分(Acid-soluble extractive,ASE)和酸不溶性组分(Acid-insoluble residue,AIR)的差异.结果显示,相同树种中,各器官凋落物的WSC相对含量呈现逐渐减小的趋势,OSC相对含量在一年中总体呈现盛叶期增加、落叶期降低的趋势,ASE相对含量在各物候期间变化不显著,AIR相对含量则表现出增加的变化趋势,凋落叶、枝木质纤维素指数(LCI)表现出上升的趋势,凋落果则为下降趋势;同一物候期,凋落物中的WSC相对含量表现为喜树高于其他树种,AIR相对含量表现为针叶树种高于阔叶树种;4个树种凋落叶在盛叶期均表现出较高的WSC和OSC相对含量,凋落枝则有较高的OSC相对含量;萌芽期和盛叶期的凋落枝呈现出较高的ASE相对含量和较低的AIR相对含量与LCI值.本研究表明,关键时期、物种类型、器官类型及其相互作用对凋落物中WSC、OSC、ASE和AIR相对含量具有不同程度的影响;结果可进一步丰富对生态系统碳的归还等特征的认识. | 何聪 任颖 麦淑媛 袁吉 游成铭 王旭熙 吴福忠 | 2019 | 应用与环境生物学报2019，25，1： | 3 |
| 2 | Decomposition dynamics and ecological stoichiometry of Quercus acutissima and Pinus densiflora litter in the Grain to Green Program Area of northern China显示文摘Litter decomposition and ecological stoichiometry of nutrient release is an important part of material cycling and energy flow in forest ecosystems.In a study of the ecological stoichiometry and nutrient release during litter decomposition in a pine–oak forest ecosystem of the Grain to Green Program(GTGP)area of northern China,a typical pine and oak species(PDS:Pinus densiflora Sieb.,QAC:Quercus acutissima Carr.)were selected in the Taiyi Mountain study area.The ecological stoichiometry characteristics of carbon(C),nitrogen(N)and phosphorus(P)and litter decomposition dynamics were studied by field sampling and quantitative analyses.The results showed the following.(1)The decomposition dynamics of both litters was slow-fast-slow.The most important climatic factor affecting the litter decomposition rate from May to October was precipitation and temperature from November to April of the following year.(2)Throughout the 300-day study,in both litters,C of the two litters was released,N first accumulated and was then released,and P exhibited a release-accumulate-release pattern.(3)C:P was significantly higher than C:N and N:P(p<0.05);the C:N of PSD litter was higher than that of QAC(p<0.05),but the N:P of QAC litter was higher than that of PSD litter(p<0.05).The C:N of both litters was very high in the study area,indicating that the nutrient release ability during litter decomposition in the two typical pine–oak forest ecosystems was relatively weak;therefore,more attention should be paid to nitrogen-fixing species and mixed forests in the GTGP area of northern China. | Jianni Sun Peng Gao Haidong Xu Cheng Li Xiang Niu | 2020 | Journal of Forestry Research2020，31，5： | 0 |
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