Stable carbon isotope as a signal index for monitoring grassland degradation.
Stable carbon isotope as a signal index for monitoring grassland degradation.
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稳定碳同位素作为监测草地退化的信号指标
DOI：
10.1038/srep31399
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发表时间：
2016-08-16
影响因子：
4.6
通讯作者：
Wang C
中科院分区：
文献类型：
--
作者：
Yao H;Wilkes A;Zhu G;Zhang H;Liu X;Dan Ding;Zhai X;Tang S;Chen Q;Zhang Y;Huang D;Wang C
由于过度放牧造成的草地退化在世界许多地区都很常见。分析了稳定碳同位素（δ 13 C）作为草地退化过程微观结构监测指标的潜力。对我国7种草地类型的植物叶片、根系和土壤的δ 13 C值进行了测定。结果表明，OG草地中适口植物叶片δ 13 C值（δ 13 Cleaf）和根系δ 13 C值（δ 13 Croot）均比NG草地低。在高海拔（3000~ 5000 m），δ 13 C叶和δ 13 C土与海拔和纬度呈正相关，δ 13 C根与海拔和纬度呈负相关，在低海拔（0~ 2000 m），δ 13 C根和δ 13 C土与海拔和纬度呈负相关。因此，追踪草地生态系统δ 13 C的变化可以为草地退化程度的评价提供有力的工具。
Grassland degradation due to overgrazing is common in many areas of the world. This study analyzed the potential of the stable carbon isotope (δ13C) value as a structural microcosmic index to monitor processes of grassland degradation. The δ13C values of plant leaves, roots and soils in non-grazed (NG) and over-grazed (OG) grassland were measured from samples collected from the seven types of grassland in China. We found that the leaf δ13C values of palatable species (δ13Cleaf) and root δ13C values (δ13Croot) in OG grasslands were reduced compared with those from NG grasslands. Furthermore, the δ13Cleaf and δ13Csoil were positive correlation with elevation and latitude, δ13Croot was negative correlation with them at high altitude (3000~5000m), and δ13Croot and δ13Csoil were negative correlation with them at low altitude (0~2000m), respectively. Consequently, tracing of the δ13C variations in grassland ecosystem can provide a powerful tool to evaluate the degree of grassland degradation.