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| 1 | 科尔沁沙地沙丘固定过程中植物生物量及土壤特性显示文摘为了解沙丘固定不同阶段植物群落的生物量特点及土壤理化特性的变化规律,研究比较了科尔沁沙地流动沙丘、半固定沙丘、固定沙丘、沙质草地4种生境的地上、地下生物量,并分4层土壤深度分析了土壤理化特性的演变特征及相关关系。结果表明:(1)植物地上生物量与地下生物量显著正相关,0~10cm土层地下生物量最大,随着沙丘的固定,地下10~20、20~40、40~60cm深度土层的生物量显著增加,植物地上生物量依次增大,分别为2.20、98.10、131.41、190.38g·m-2,地下地上生物量比依次为10.44、1.67、0.81、1.18;(2)随着沙丘的固定,表层土壤容重由1.62g·cm3下降到1.33g·cm3,各土层的粉沙和极细沙的占比依次增加,中沙比例依次减小,土壤碳氮含量、碳氮比、pH值、电导率均逐渐增加;(3)地上、地下生物量均与表层土壤碳氮含量、pH值、电导率显著正相关,土壤碳、氮含量均与pH值、电导率、土壤水分含量显著正相关,与土壤容重显著负相关(p<0.05)。综上所述,沙丘恢复过程中植物生物量的增加与表层土壤颗粒细化、营养物质增多、水分增加密切相关,土壤-植被系统构成了有机的综合体。 | 周欣 左小安 赵学勇 刘川 罗永清 岳祥飞 吕朋 | 2015 | 中国沙漠2015，35，1： | 12 |
| 2 | Advances in research of function and valuation of ecosystem services显示文摘It is widely accepted that there is an economic progress beyond the Gross Domestic Product(GDP), while global GDP has increased more than three-fold since 1950, whereas ecosystems have been largely occupied and depleted. Since the 1990 s, emphasis has focused on function and valuation of ecosystem services, which is rarely treated as a market issue. This paper reviews recent developments on measures to evaluate and assess ecosystem services, while elucidating the function of ecosystem services. On the one hand, functions of ecosystem services are subdivided into several items such as gas regulation, water regulation, soil and nutrient recycling. Also, there exist intellectually guided functions of ecosystem services, such as culture and recreation. On the other hand, ecosystems can be viewed as a supplier in the trade between human beings and natural resources such that all resources can be labeled and quantified. | Li Liu Qi Feng | 2015 | Research in Cold and Arid Regions2015，7，2： | 0 |
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