川西亚高山3种典型森林土壤碳矿化特征  

Soil organic carbon mineralization characteristics of three dominant subalpine forests in western Sichuan, China

作　　者：杨开军[1,2] 杨万勤[1,2] 贺若阳 庄丽燕 李志杰[1,2] 聂富育 王壮[1,2] 徐振锋[1,2] YANG Kaijun YANG Wanqin HE Ruoyang ZHUANG Liyan LI Zhijie NIE Fuyu WANG Zhuang XU Zhenfeng(Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology ＆ Forest, Siehuan Agricultural University, Chengdu 611130, China Long-term Research Station of Alpine Forest Ecosystems and Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Sichuan Agricultural University, Chengdu 611130, China)

机构地区：[1]四川农业大学生态林业研究所,四川省林业生态工程重点实验室,成都611130 [2]四川农业大学高山森林生态系统定位研究站,长江上游生态安全协同创新中心,成都611130

出　　处：《应用与环境生物学报》2017年第5期851-856,共6页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(31570601;31570445;31500509);中国博士后科学基金项目(2013M540714;2014T70880)资助~~

摘　　要：为了解森林转化对土壤碳矿化过程的影响,采用室内培养法对川西亚高山3种典型森林(天然林、桦木次生林和云杉人工林)土壤碳矿化过程进行219 d的动态监测.结果表明,3种森林土壤碳矿化速率随培养时间增加而下降,矿化积累量随时间增加而增加,土壤有机层碳矿化速率和积累量均显著高于对应矿质土壤层;在土壤有机层,天然林和桦木次生林土壤碳矿化速率和积累量均显著高于云杉人工林,而在矿质土壤层3种森林无显著差异.培养结束时,3种森林有机层矿化积累量占总有机碳比值分别为11%、8%和11%,矿质土壤层分别为4%、6%和4%.森林群落、土壤层次和培养时间及三者交互作用对土壤碳矿化和积累量均有显著影响.土壤生物化学特性与土壤碳矿化率和积累量显著相关.单指数模型能很好地拟合土壤碳矿化特征.综上所述,森林转化对川西亚高山土壤碳矿化影响显著,主要表现在土壤有机层.To understand the effects of forest type conversion on the soil carbon mineralization process, soil samples were collected from the organic and mineral layers of three adjacent forest ecosystems （natural coniferous forest, birch secondary forest, and dragon spruce plantation）. Soil carbon mineralization rates were measured using an alkali absorption method over 219 days and were shown to decrease while the cumulative mineralization carbon increased with incubation time in the three forest types. Moreover, the soil carbon mineralization rates and cumulative mineralized carbon were significantly higher in the organic layer than they were in the mineral layer regardless of forest types. In the organic layer, the soil carbon mineralization rates and cumulative mineralized carbon were greater in both natural forests than they were in the spruce plantation. However, no significant differences were observed amongst the three forests in the mineral layer. The forest type, soil layer, incubation time, and their interactions all had significant effects on soil carbon mineralization rates. At the end of the incubation, the cumulative mineralization of soil organic carbon in the organic layer of the natural coniferous, birch secondary, and dragon spruce plantation forests accounted for 11%, 8%, and 11%, respectively, while the corresponding values in the mineral layer were 4%, 6%, and 4%, respectively. Soil biochemical properties were significantly correlated with the soil carbon mineralization rates and cumulative mineralized carbon. A first-order exponential model showed an adequate fit to the soil carbon mineralization process. Our results suggest that forest land-use change had significant effects on soil carbon mineralization and the effect was greater in the organic layer than it was in the mineral layer.

关 键 词：川西亚高山森林 森林类型 有机层 矿质层 土壤碳矿化 土壤性质 

分 类 号：S714[农业科学—林学]