喀纳斯自然保护区林地和草地土壤呼吸速率差异及影响因素

发布时间：2018-02-09 15:11

本文关键词： 喀纳斯自然保护区土壤呼吸速率土壤温度土壤湿度　出处：《土壤》2017年01期 　论文类型：期刊论文

【摘要】：为了研究新疆喀纳斯国家自然保护区森林生态和草地生态系统与大气的相互作用,分析土壤呼吸速率的时空变异特征及与影响因子的关系,2012年及2013年5月上旬至9月上旬利用土壤碳通量测量系统LI-8150对林地和草地两种植被类型土壤的呼吸速率日动态进行了全天连续自动监测,研究了两类土壤呼吸速率在生长季各月日的变化规律。结果表明:林地和草地生态系统土壤呼吸速率在植被生长季内均呈现较明显的单峰曲线型日变化,其月最大值均出现在7月,林地土壤呼吸速率的最大值(2.43μmol/(m~2·s))显著高于草地土壤呼吸速率最大值(1.55μmol/(m~2·s)),且各月林地生态系统的土壤呼吸速率均明显高于草地,波峰出现在北京时间17:00—18:00,波谷出现在北京时间9:00—10:00,草地最小值出现在6月(0.35μmol/(m~2·s)),而林地最小值出现在5月,其呼吸速率仅0.71μmol/(m~2·s),且整个生长季白天大于晚上,全天以呼出CO_2为主。植被生长季内林地和草地土壤呼吸速率与土壤温度的变化趋势相似,具有显著的正相关性,但与土壤含水量的变化没有这样的趋势。
[Abstract]:In order to study the interaction between forest ecology and grassland ecosystem and atmosphere in Kanas National Nature Reserve, Xinjiang, The spatial and temporal variability of soil respiration rate and the relationship between soil respiration rate and influencing factors were analyzed. From 2012 to early May 2013 to early September, soil carbon flux measurement system (LI-8150) was used to measure soil respiration rate of forest land and grassland. Dynamic continuous automatic monitoring throughout the day, The changes of soil respiration rate of two kinds of soil in each month of growing season were studied. The results showed that soil respiration rate of forestland and grassland ecosystem showed obvious single-peak curve diurnal variation in vegetation growing season. In July, the maximum value of soil respiration rate in forestland was 2.43 渭 mol/(m~2 路s ~ (-1), which was significantly higher than that in grassland (1.55 渭 mol/(m~2 路s ~ (-1)), and the soil respiration rate of forestland ecosystem was significantly higher than that of grassland in every month. The peak appeared at 17: 00-18: 00 Beijing time, the trough appeared at 9: 00-10: 00 Beijing time, the minimum value of grassland appeared on June, and the minimum value of forest land appeared on May. The respiration rate of forest land was only 0.71 渭 mol/(m~2 路s-1, and the whole growing season was larger than that of night during the whole growing season. The respiration rate of forest land and grassland was similar to the change trend of soil temperature and had a significant positive correlation with the change of soil water content, but there was no such trend with the change of soil water content.
【作者单位】：南京信息工程大学环境科学与工程学院;中国气象局乌鲁木齐沙漠气象研究所中国气象局树木年轮理化研究重点实验室/新疆维吾尔自治区树木年轮生态重点实验室;新疆农业科学院土壤肥料与农业节水研究所;布尔津县气象局;
【基金】：国家自然科学基金项目(41675152) 中央公益性基本科研业务费项目(IDM2016006) 公益性行业(气象)科研专项(GYHY(QX)201506001)资助
【分类号】：S714;S812.2

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