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雨强对红壤坡耕地泥沙流失及有机碳富集的影响规律研究
引用本文:聂小东,李忠武,王晓燕,申卫平,张 雪,郭 旺,马文明,王曙光.雨强对红壤坡耕地泥沙流失及有机碳富集的影响规律研究[J].土壤学报,2013,50(5):900-908.
作者姓名:聂小东  李忠武  王晓燕  申卫平  张 雪  郭 旺  马文明  王曙光
作者单位:湖南大学环境科学与工程学院,湖南大学环境科学与工程学院,长沙理工大学土木与建筑学院,邵阳市水土保持科学研究所,湖南大学环境科学与工程学院,湖南大学环境科学与工程学院,湖南大学环境科学与工程学院,邵阳市水土保持科学研究所
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
摘    要:在典型红壤丘陵区平均坡度为10?的坡耕地径流小区 (2 m?5 m) 上进行降雨强度为1.69 mm min-1(大雨强)、1.31 mm min-1(中雨强)和0.64 mm min-1(小雨强)的模拟降雨试验,并对模拟降雨过程中泥沙的迁移规律和泥沙有机碳的流失富集规律进行了研究。研究结果表明:侵蚀作用下泥沙流失量随着降雨强度的增大而增加,并与径流量呈显著的立方关系,径流量是坡耕地土壤流失的重要影响因素;土壤有机碳流失以泥沙结合态为主,泥沙态有机碳流失量占总有机碳流失量的84%以上,最高达到97.6%;泥沙中有机碳富集比随着降雨强度的增大而逐渐减小,有机碳的选择性迁移在低强度降雨条件下表现更为明显;中雨强和小雨强下有机碳的富集比与黏粒的富集比分别呈极显著和显著正相关,而大雨强泥沙有机碳富集比与黏粒富集比没有显著的线性关系。雨强是影响泥沙流失和泥沙有机碳迁移的重要因素。

关 键 词:降雨强度  坡耕地  泥沙  有机碳  富集比
收稿时间:2012/11/15 0:00:00
修稿时间:2013/2/20 0:00:00

Effect of rainfall intensity on soil loss from slope farmland of red soil and organic carbon enrichment in sediment
Nie Xiaodong,Li Zhongwu,Wang Xiaoyan,Shen weiping,Zhang Xue,Guo Wang,Ma Wenming and Wang Shuguang.Effect of rainfall intensity on soil loss from slope farmland of red soil and organic carbon enrichment in sediment[J].Acta Pedologica Sinica,2013,50(5):900-908.
Authors:Nie Xiaodong  Li Zhongwu  Wang Xiaoyan  Shen weiping  Zhang Xue  Guo Wang  Ma Wenming and Wang Shuguang
Abstract:Simulated rainfalls, 1.69 mm min-1 (high), 1.31 mm min-1 (moderate) and 0.64 mm min-1 (low) in intensity, were performed on plots of farmland, 2 m×5 m each in area and 10° in average slope gradient, on a red soil hill typical of hilly regions, to study on rules of migration,of sediments and enrichment of organic carbon therein. Results show that soil loss increased with rainfall intensity, and demonstrated a significant cubic relationship with volume of runoff, which is an important factor influencing soil loss on slope farmland; Sediment-bonded soil organic carbon is the mainly form of organic carbon lost with runoff, accounting for more than 84% and even 97.6% of the total loss of organic carbon. Organic carbon enrichment ratio of the sediments decreases gradually with increasing rainfall intensity, and selective migration of organic carbon was more evident in rainfalls low in intensity. In rainfalls, high in intensity, no significant linear relationship was observed between organic carbon enrichment ratio and clay enrichment ratio, but in rainfalls, moderate or low in intensity, an extremely significant or significant positive relationship was observed, respectively. Therefore, it can be concluded that rainfall intensity is an important factor that affects soil loss and migration of organic carbon with sediments.
Keywords:Rainfall intensity  Arable land with slop  Sediment  Organic carbon  Enrichment ratio
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