The effect of desertification on carbon and nitrogen status in the northeastern margin of the Qinghai-Tibetan Plateau
The effect of desertification on carbon and nitrogen status in the northeastern margin of the Qinghai-Tibetan Plateau
复制标题
荒漠化对青藏高原东北缘碳氮状况的影响
DOI：
10.1007/s12665-013-2482-0
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发表时间：
2013
影响因子：
2.8
通讯作者：
Hu, Guangyin
中科院分区：
文献类型：
--
作者：
Lu, Junfeng;Dong, Zhibao;Li, Wenjin;Hu, Guangyin
荒漠化导致的环境退化往往加速草地生态系统生物多样性的丧失，改变草地生态系统的碳、氮储量。为评价荒漠化对植物多样性和碳、氮储量的影响，对青藏高原东北缘沿着5个不同荒漠化程度区域（对照、轻度、中度、重度和极重度）的植物和土壤物种组成和碳、氮含量进行了调查。研究表明：（1）物种组成和丰富度随草地荒漠化的发展而发生显著变化;（2）对照区地上生物量C和N含量分别为101.60和4.03 g m−2。与对照相比，从轻度、中度、重度到极重度，地上部C、N含量均显著降低。(3)对照0-40 cm土层的根系C、N含量分别为1372.83和31.49 g m-2，而0-40 cm土层的根系C、N含量也从对照、轻度、中度、重度到极重度阶段呈下降趋势。(4)与植物相比，土壤对C和N分布的贡献更大，其中对照0-40 cm深度的土壤有机C和全N含量分别为20，386.70和3，587.89 g m−2。与此同时，土壤有机C和N含量也从对照到非常严重阶段显著下降。这些结果表明，草地荒漠化不仅改变了高寒草甸的物种组成，导致植物多样性的丧失，而且导致有机碳和氮的大量流失，对减少温室气体排放具有负面影响。
Environmental degradation resulting from desertification often accelerates biodiversity loss and alters carbon (C) and nitrogen (N) stocks within grassland ecosystem. In order to evaluate the effect of desertification on plant diversity and carbon (C) and nitrogen (N) stocks, species compositions and C and N contents in plants and soil were investigated along five regions with different degrees of desertification in the northeastern margin of the Qinghai-Tibetan Plateau (control, light, moderate, severe and very severe stages). The study showed: (1) species composition and richness changed significantly with the development of grassland desertification; (2) the aboveground biomass C and N contents in the control were 101.60 and 4.03 g m−2, respectively. Compared to the control, the aboveground tissue C and N contents significantly decreased from light, moderate, severe to very severe stages. (3) The root C and N contents in the control in 0–40 cm depth are 1,372.83 and 31.49 g m−2, respectively, while the root C and N contents in 0–40 cm were also declining from the control, light, moderate, severe to very severe stages. (4) Compared to the plant, the soil made a greater contribution for C and N distribution, in which the soil organic C and total N contents in 0–40 cm depth in the control are 20,386.70 and 3,587.89 g m−2, respectively. At the same time, soil organic C and N contents also decreased significantly from the control to very severe stages. These results suggest that grassland desertification not only alters species compositions and leads to the loss of plant diversity, but also results in greater loss of organic C and N in alpine meadow, in which there is a negative effect on reducing greenhouse gas emission.
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影响因子：
6.2
作者：
Halin Zhao;Yuhui He;R. Zhou;Yong-zhong Su;Yuqiang Li;Sam Drake
通讯作者：
Halin Zhao;Yuhui He;R. Zhou;Yong-zhong Su;Yuqiang Li;Sam Drake
影响因子：
5
作者：
Duan, ZH;Xiao, HL;Wang, G
通讯作者：
Wang, G
影响因子：
4.8
作者：
Fan, Jiangwen;Zhong, Huaping;Yue, Yanzhen
通讯作者：
Yue, Yanzhen
影响因子：
11.6
作者：
A. Elmore;G. Asner
通讯作者：
A. Elmore;G. Asner
DOI：
10.5860/choice.33-2731
发表时间：
1995-05
期刊：
--
影响因子：
--
作者：
R. Lal
通讯作者：
R. Lal