应用生态学报2017，Vol.28Issue(11)：3634-3642,9.DOI:10.13287/j.1001-9332.201711.024
黑土坡耕地有机碳及其组分累积-损耗格局对耕作侵蚀与水蚀的响应
Responses of accumulation-loss patterns for soil organic carbon and its fractions to tillage and water erosion in black soil area
摘要
Abstract
Tillage and water erosion have been recognized as the main factors causing degradation in soil organic carbon (SOC) pools of black soil.To further explore the response of SOC and its fractions to different driving forces of erosion (tillage and water),geostatistical methods were used to analyze spatial patterns of SOC and its three fractions at a typical sloping farmland based on tillage and water erosion rates calculated by local models.The results showed that tillage erosion and deposition rates changed according to the slope positions,decreasing in the order:upper-slope ＞ lowerslope ＞ middle-slope ＞ toe-slope and toe-slope ＞ lower-slope ＞ middle-slope ＞ upper-slope,respectively;while the order of water erosion rates decreased in the order:lower-slope ＞ toe-slope ＞ middle-slope ＞ upper-slope.Tillage and water erosion cooperatively triggered intense soil loss in the lower-slope areas with steep slope gradient.Tillage erosion could affect C cycling through the whole slope at different levels,although the rate of tillage erosion (0.02-7.02 t · hm-2 · a-1) was far less than that of water erosion (5.96-101.17 t · hm-2 · a-1) in black soil area.However,water erosion only played a major role in controlling C dynamics in the runoff-concentrated lower slope area.Affected by water erosion and tillage erosion-deposition disturbance,the concentrations of SOC,particulate organic carbon and dissolved organic carbon in depositional areas were higher than in erosional areas,however,microbial biomass carbon showed an opposite trend.Tillage erosion dominated SOC dynamic by depleting particulate organic carbon.关键词
耕作侵蚀/微生物生物量碳/水溶性碳/颗粒有机碳/空间分布Key words
tillage erosion/microbial biomass carbon/dissolved organic carbon/particulate organic carbon/spatial distribution引用本文复制引用
赵鹏志,陈祥伟,王恩姮..黑土坡耕地有机碳及其组分累积-损耗格局对耕作侵蚀与水蚀的响应[J].应用生态学报,2017,28(11):3634-3642,9.基金项目
本文由国家林业公益性行业科研专项(201404202)和国家自然科学基金项目(41302222,41271293)资助 This work was supported by the Forestry Industry Research Special Funds for Public Welfare Project (201404202) and National Natural Science Foundation of China (41302222,41271293). （201404202）
