Effect of Large-Scale Cultivated Land Expansion on the Balance of Soil Carbon and Nitrogen in the Tarim Basin
Effect of Large-Scale Cultivated Land Expansion on the Balance of Soil Carbon and Nitrogen in the Tarim Basin
复制标题
塔里木盆地大规模耕地扩张对土壤碳氮平衡的影响
DOI：
10.3390/agronomy9020086
复制
发表时间：
2019-02
期刊：
影响因子：
3.7
通讯作者：
Xu Yongmei
中科院分区：
文献类型：
--
作者：
Xu Erqi;Zhang Hongqi;Xu Yongmei
土地复垦对土壤碳氮循环有一定影响，但其对土壤碳氮平衡的尺度效应和时间效应尚不明确。以塔里木盆地为研究区域，通过土地利用和土壤样品的多时间变化，探讨了土地复垦对土壤有机碳（SOC）、全氮（TN）和碳氮比（C：N）的影响。遥感探测到，从1978年到2015年，农田面积几乎翻了一番。空间分析技术被用来确定土地的变化，包括以前的土地利用和耕作年龄。利用土地复垦历史信息，在2015年进行了一次专门设计的土壤采样，并与2015年的土壤性质进行了比较。1978.结果表明，C：N比值与土壤有机碳（SOC）和全氮（TN）之间存在解耦关系，表明土壤有机碳（SOC）和全氮（TN）的变化并不直接对应于C：N比值的变化。土地复垦历史加上基线效应对SOC、TN和C：N比值的时间变化率有相反的影响。土壤有机碳和全氮在退耕初期呈下降趋势，随后随着退耕时间的延长而恢复。相比之下，草地土壤的C：N比在开垦初期呈上升趋势，但随着开垦时间的延长，其上升幅度逐渐减小;森林土壤的C：N比则呈下降趋势，并随开垦时间的延长而波动。新开垦草地的C：N比低于全球平均值，且随着开垦年限的增加，C：N比呈下降趋势。建议可持续农业管理措施，以提高土壤碳和氮的积累，以及增加C：N比，以匹配氮沉降，以更大的碳封存。
Land reclamation influences the soil carbon and nitrogen cycling, but its scale and time effects on the balance of soil carbon and nitrogen are still uncertain. Taking the Tarim Basin as the study area, the impact of land reclamation on the soil organic carbon (SOC), total nitrogen (TN), and carbon to nitrogen (C:N) ratio was explored by the multiple temporal changes of land use and soil samples. Remote sensing detected that cropland nearly doubled in area from 1978 to 2015. Spatial analysis techniques were used to identify land changes, including the prior land uses and cultivation ages. Using land reclamation history information, a specially designed soil sampling was conducted in 2015 and compared to soil properties in ca. 1978. Results found a decoupling characteristic between the C:N ratio and SOC or TN, indicating that changes in SOC and TN do not correspond directly to changes in the C:N ratio. The land reclamation history coupled with the baseline effect has opposite impacts on the temporal rates of change in SOC, TN and C:N ratios. SOC and TN decreased during the initial stage of conversion to cropland and subsequently recovered with increasing cultivation time. By contrast, the C:N ratio for soils derived from grassland increased at the initial stage but the increase declined when cultivated longer, and the C:N ratio decreased for soils derived from forest and fluctuated with the cultivation time. Lower C:N ratios than the global average and its decreasing trend with increasing reclamation age were found in newly reclaimed croplands from grasslands. Sustainable agricultural management practices are suggested to enhance the accumulation of soil carbon and nitrogen, as well as to increase the C:N ratio to match the nitrogen deposition to a larger carbon sequestration.
登录
查看更多内容
DOI：
10.2136/sssaj1976.03615995004000060026x
发表时间：
1976-01-01
影响因子：
2.9
作者：
GALLAHER, RN;WELDON, CO;BOSWELL, FC
通讯作者：
BOSWELL, FC
影响因子：
2.4
作者：
S. Livesley;Alessandro Ossola;C. Threlfall;A. Hahs;Nicholas S. G. Williams
通讯作者：
S. Livesley;Alessandro Ossola;C. Threlfall;A. Hahs;Nicholas S. G. Williams
影响因子：
2.7
作者：
Yuanming Zhang;Yaning Chen;B. Pan
通讯作者：
Yuanming Zhang;Yaning Chen;B. Pan
影响因子：
3.7
作者：
Cools, N.;Vesterdal, L.;Hansen, K.
通讯作者：
Hansen, K.
影响因子：
6.5
作者：
Li, Zhongwu;Liu, Chun;Zeng, Guangming
通讯作者：
Zeng, Guangming