不同土地利用类型对伊犁地区土壤活性有机碳库和碳库管理指数的影响

发布时间：2018-06-29 22:09

本文选题：土地利用类型 + 土壤活性有机碳库　；参考：《水土保持研究》2017年01期

【摘要】：土壤碳库管理指数(CPMI)可以比较准确地发现人为因素对土地利用的干扰情况。以伊犁河谷不同土地利用类型(耕地、林地、草地和荒地)为研究对象,分析了不同土地利用类型土壤有机碳(SOC)含量、活性有机碳含量及其在SOC中的分配情况,各类有机碳含量之间的相关性、CPMI。研究表明:(1)不同土地利用类型SOC含量和水溶性有机碳(WSOC)含量有显著差异,SOC含量为草地林地耕地荒地;WSOC含量为耕地(最高)荒地(最低);易氧化碳(ROC)含量为草地最低;在0—20cm和20—40cm土层,微生物量碳(MBC)含量为草地(最高)林地(最低);ROC含量为荒地高于草地。不同土地利用类型SOC含量均随土层深度增加而降低;ROC含量均随土层深度增加而升高;除林地外,其他样地MBC含量均随土层深度增加呈先升高后降低趋势,而WSOC含量均随土层深度增加而逐渐降低。(2)不同土地利用类型下ROC,MBC和WSOC所占SOC比例各不相同,且碳库的活度主要取决于ROC所占比例,ROC所占比例为荒地耕地林地草地;MBC所占比例为荒地耕地草地林地;WSOC所占比例为耕地林地荒地草地。同一土地利用类型各活性有机碳所占比例情况为ROCMBCWSOC。(3)不考虑土层深度影响,耕地ROC含量与MBC含量呈极显著线性负相关;林地SOC含量与ROC含量呈显著线性负相关;荒地SOC含量与WSOC含量呈极显著线性正相关。不同土地利用类型下SOC,ROC,MBC,WSOC含量之间线性相关程度总体偏低。(4)同一土地利用类型,CPMI均随土层深度的加深先增大后减小;0—20cm土层的CPMI为林地荒地(100)耕地草地。土地利用类型由荒地、草地、耕地转变为林地,有利于CPMI的提高,有利于土壤培肥,促进碳循环。
[Abstract]:Soil carbon pool management index (CPMI) can accurately detect the disturbance of human factors to land use. Soil organic carbon (SOC) content, active organic carbon content and their distribution in different land use types (cultivated land, woodland, grassland and wasteland) in Yili River Valley were analyzed. The correlation between organic carbon content and CPMI. The results showed that: (1) there were significant differences in SOC content and WSOC content between different land use types and water soluble organic carbon (WSOC) content: the content of WSOC in grassland and woodland was the highest (highest) and the content of readily oxidized carbon (ROC) was the lowest in grassland. In 0-20cm and 20-40cm soil layers, microbial biomass carbon (MBC) content was higher in grassland (highest) forest land (lowest) than in grassland. The SOC content of different land use types decreased with the increase of soil depth, and the content of ROC increased with the increase of soil depth, except for forest land, the content of MBC in other plots increased first and then decreased with the increase of soil depth. However, WSOC content decreased gradually with the increase of soil depth. (2) the percentage of MBC and WSOC in ROCU MBC and WSOC were different in different land use types. The activity of carbon pool mainly depends on the proportion of ROC. The proportion of ROC is the proportion of wasteland, cultivated land, woodland, grassland, MBC, the proportion of wasteland, cultivated land, grassland, woodland, woodland and grassland. The proportion of active organic carbon in the same land use type was ROCMBCWSOC. (3) without considering the influence of soil depth, there was an extremely significant linear negative correlation between soil ROC content and MBC content in cultivated land, and a significant linear negative correlation between SOC content and ROC content in forest land. There was a significant linear positive correlation between SOC content and WSOC content in wasteland. Under different land use types, the linear correlation between WSOC content of SOCROCN MBCN was generally low. (4) the CPMI of the same land use type increased first with the deepening of soil depth and then decreased the CPMI of 0-20cm soil layer as woodland wasteland (100) cultivated land grassland. The change of land use type from wasteland, grassland and cultivated land to woodland is beneficial to the improvement of CPMI, soil fertility and carbon cycling.
【作者单位】：伊犁师范学院生物与地理科学学院;
【基金】：伊犁师范学院校级科研资助项目“土地利用方式对伊犁土壤活性有机碳库和碳库管理指数的影响”(2015YSYB22)
【分类号】：S153.6

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