松嫩草甸草地碱茅群落根呼吸对土壤呼吸的贡献

被引:25
作者
王娓 [1 ]
郭继勋 [2 ]
机构
[1] 东北师范大学城市与环境科学学院
[2] 东北师范大学植被生态科学教育部重点实验室
关键词
草甸草地; 微生物碳; 根呼吸; 土壤呼吸;
D O I
暂无
中图分类号
S812.2 [草原土壤学];
学科分类号
0713 ;
摘要
采用土壤呼吸和根生物量线性回归法估算了松嫩草甸草地碱茅群落生长季节根呼吸对土壤呼吸的贡献量.土壤呼吸速率6月末达到最大值2.45μmol·m?2·s?1,9月降至最小值0.39μmol·m?2·s?1.土壤温度是土壤呼吸季节变化的决定因素.根生物量变化范围为0.54~0.97kg·m?2,没有显著的季节变化.微生物碳8月中旬达到最大值,为0.50g·m?2.微生物碳的空间变异非常小,变异系数不超过5%.根呼吸速率的季节变化不同于微生物呼吸速率.根呼吸速率最大值(1.39μmol·m?2·s?1)出现在6月末,最小值(0.19μmol·m?2·s?1)出现在5月;微生物呼吸速率最大值(1.27μmol·m?2·s?1)出现在7月,最小值(0.11μmol·m?2·s?1)出现在9月.微生物呼吸速率和土壤温度之间具有显著的指数相关,根呼吸速率和土壤温度之间的相关性不显著.根呼吸对土壤呼吸的贡献量在春季和夏季为24%57%,秋季升至73%.
引用
收藏
页码:559 / 564
页数:6
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