桂西南石漠化区蚬木林土壤呼吸空间变异研究.pdf

第 36 卷 第2 期 生 态 科 学 36(2): 8286 2017 年 3 月 Ecological Science Mar. 2017 申文辉, 郑威, 何琴飞, 等. 桂西南石漠化区蚬木林土壤呼吸空间变异研究[J]. 生态科学, 2017, 36(2): 8286. SHEN Wenhui, ZHENG Wei, HE Qinfei, et al. Spatial variation of soil respiration in Excentrodendron hsienmu forest in karst area in southwestern Guangxi, China[J]. Ecological Science, 2017, 36(2): 8286. 桂西南石漠化区蚬木林土壤呼吸空间变异研究 * 申文辉, 郑威 , 何琴飞, 何峰 广西壮族自治区林业科学研究院, 南宁 530002 【摘要】 通过对石漠化区蚬木林土壤呼吸及其影响因子的测定和分析, 研究蚬木林土壤呼吸的空间变异性。结果表明: 随取 样面积增大, 土壤呼吸速率变异系数从 25.64%增至 48.48%; 土壤呼吸空间变异幅度为 46.84%, 高于其他环境因子, 土壤温度 和 pH 变异幅度最小。土壤呼吸仅与土壤温度间存在显著相关关系, 与其他因子无显著相关性。在 95%置信水平、85%估计精 度下, 蚬木林土壤呼吸测定取样需大于 37 个, 而土壤温度、土壤pH 仅需 1 个取样即可, 样本容量计算可明显降低取样工作量。 关键词：土壤呼吸; 空间变异; 石漠化区; 蚬木林 doi:10.14108/ki.1008-8873.2017.02.012 中图分类号：S718.55 文献标识码：A 文章编号：1008-8873(2017)02-082-05 Spatial variation of soil respiration in Excentrodendron hsienmu forest in karst area in southwestern Guangxi, China * SHEN Wenhui, ZHENG Wei , HE Qinfei, HE feng Guangxi Forestry Research Institute, Nanning 530002, China Abstract: Soil respiration has obvious spatial variation in different scale. The soil respiration and its control factors were measured to detect the soil spatial variation in an Excentrodendron hsienmu forest in karst area. The results show that soil respiration rate has the largest variable coefficients than the other environment factors; pH and temperature of soil have the smallest variable coefficients. Soil respiration has the significant relationship with soil temperature, and no significant relationship with the other factors.