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>Spatial Variation in Carbon and Nitrogen in Cultivated Soils in Henan Province, China: Potential Effect on Crop Yield
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Spatial Variation in Carbon and Nitrogen in Cultivated Soils in Henan Province, China: Potential Effect on Crop Yield
Improved management of soil carbon (C) and nitrogen (N) storage in agro-ecosystems represents an important strategy for ensuring food security and sustainable agricultural development in China. Accurate estimates of the distribution of soil C and N stores and their relationship to crop yield are crucial to developing appropriate cropland management policies. The current study examined the spatial variation of soil organic C (SOC), total soil N (TSN), and associated variables in the surface layer (0–40 cm) of soils from intensive agricultural systems in 19 counties within Henan Province, China, and compared these patterns with crop yield. Mean soil C and N concentrations were 14.9 g kg−1 and 1.37 g kg−1, respectively, whereas soil C and N stores were 4.1 kg m−2 and 0.4 kg m−2, respectively. Total crop production of each county was significantly, positively related to SOC, TSN, soil C and N store, and soil C and N stock. Soil C and N were positively correlated with soil bulk density but negatively correlated with soil porosity. These results indicate that variations in soil C could regulate crop yield in intensive agricultural systems, and that spatial patterns of C and N levels in soils may be regulated by both climatic factors and agro-ecosystem management. When developing suitable management programs, the importance of soil C and N stores and their effects on crop yield should be considered.
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机译：改善农业生态系统中土壤碳（C）和氮（N）存储的管理，是确保中国粮食安全和可持续农业发展的重要战略。准确估算土壤碳氮存储量的分布及其与作物产量的关系对于制定适当的农田管理政策至关重要。目前的研究调查了中国河南省19个县的集约化农业系统的土壤有机碳（SOC），总土壤N（TSN）的空间变化以及表层（0–40 cm）的相关变量，并将这些模式与农作物产量进行比较土壤平均碳和氮浓度分别为14.9 g kg -1 和1.37 g kg -1 ，而土壤C和N储量为4.1 kg m −2 和0.4 kg m −2 。每个县的农作物总产量与SOC，TSN，土壤碳氮储量以及土壤碳氮储量成正相关。土壤碳和氮与土壤容重呈正相关，与土壤孔隙度呈负相关。这些结果表明，土壤碳的变化可以调节集约型农业系统中的作物产量，并且土壤中碳和氮水平的空间格局可能受气候因素和农业生态系统管理的调节。在制定适当的管理计划时，应考虑土壤碳氮存储的重要性及其对作物产量的影响。
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