新疆巴音布鲁克天鹅湖高寒湿地土壤呼吸对水分条件的响应
发布时间：2018-11-04 10:28
【摘要】：为了揭示干旱半干旱区高寒湿地不同水分梯度对土壤呼吸规律的影响,以及土壤温度与含水量对土壤呼吸影响的差异性,以新疆巴音布鲁克天鹅湖高寒湿地为研究对象,在2014年植物生长季利用LI-8100土壤碳通量自动测量系统对不同水分条件(常年积水区、季节性积水区、常年干燥区)下的土壤呼吸速率进行测定,分析土壤呼吸日变化、季节性变化特征及其与土壤温度、土壤体积含水量的关系.结果表明:1不同水分条件下巴音布鲁克天鹅湖高寒湿地土壤呼吸速率日变化均呈明显的单峰曲线,常年积水区、季节性积水区、常年干燥区土壤呼吸速率最大值分别为1.97、7.39、8.83μmol/(m2·s),均出现在13:00—15:00;土壤CO2日累积排放量季节性变化明显,差异性达到极显著水平(P0.01),三者的最大值分别为0.12、0.45、0.40 mol/m2,地表积水显著抑制了土壤呼吸,提高了土壤碳稳定性.2不同水分条件下土壤呼吸速率与土壤温度、土壤体积含水量之间均呈极显著正相关(P0.01),常年积水区、季节性积水区和常年干燥区的Q10(土壤呼吸温度敏感性)差异性极显著(P0.01),其大小表现为常年干燥区(1.54)常年积水区(2.22)季节性积水区(3.36),各水分区域6月典型日的Q10最大,表现为常年干燥区(2.56)季节性积水区(4.30)常年积水区(4.75),说明水分条件显著影响Q10.3巴音布鲁克天鹅湖高寒湿地土壤呼吸受地下5 cm处土壤温度(T)与0~5 cm土壤体积含水量(W)的综合影响,季节性积水区土壤呼吸速率与二者之间满足最佳拟合模型Rs=-1.113+0.041W-0.366T+0.008WT,常年干燥区则满足最佳拟合模型Rs=1.470+0.023W-0.027T+0.002WT.
[Abstract]:In order to reveal the effects of different water gradients on soil respiration in arid and semi-arid alpine wetland and the difference between soil temperature and water content on soil respiration, the alpine wetland of Bayinbrook Swan Lake in Xinjiang was studied. In the plant growth season of 2014, the soil respiration rate under different water conditions (perennial hydrops, seasonal hydrops, perennial dry areas) was measured by LI-8100 soil carbon flux automatic measurement system, and the diurnal variation of soil respiration was analyzed. Seasonal variation and its relationship with soil temperature and soil volume water content. The results showed that: (1) the diurnal variation of soil respiration rate in the alpine wetland of Bayinbrook Swan Lake under different water conditions showed obvious single peak curve, perennial hydrops and seasonal hydrops. The maximum soil respiration rate in dry area was 1.97 ~ 7.39 渭 mol/ (m ~ 2 s),) at 13: 00-15: 00; The diurnal cumulative emissions of soil CO2 varied significantly (P0.01), and the maximum values of the three levels were 0.120.45 and 0.40 mol/m2, respectively, which significantly inhibited soil respiration. The soil carbon stability was improved. 2 the soil respiration rate was positively correlated with soil temperature and volumetric water content under different water conditions (P0.01), and there was no significant correlation between soil respiration rate and soil temperature (P0.01). The Q10 (soil respiration temperature sensitivity) of seasonal hydrops and perennial dry areas was significantly different (P0.01), and its size was as follows: perennial dry area (1.54), perennial hydrops area (2.22) and seasonal stagnant area (3.36). The Q10 of the typical days in June was the highest in each water area, showing that the seasonal water accumulation area (4.30) was perennial dry area (2.56), and the seasonal water accumulation area (4.75). The results showed that soil respiration in Q10.3 Bayinbrook Swan Lake alpine wetland was significantly affected by soil temperature (T) at 5 cm underground and soil volume water content (W) at 0 5 cm. The optimum fitting model Rs=-1.113 0.041W-0.366T 0.008 WTbetween soil respiration rate and soil respiration rate in seasonal hydrops and Rs=1.470 0.023W-0.027T 0.002 WT2 in perennial dry area were satisfied.
【作者单位】： 新疆农业大学草业与环境科学学院新疆土壤与植物生态过程重点实验室;
【基金】：新疆农业大学草业科学国家重点学科项目(XJCYB-2012-02) 国家自然科学基金项目(41305136)
【分类号】：S151.9
[Abstract]:In order to reveal the effects of different water gradients on soil respiration in arid and semi-arid alpine wetland and the difference between soil temperature and water content on soil respiration, the alpine wetland of Bayinbrook Swan Lake in Xinjiang was studied. In the plant growth season of 2014, the soil respiration rate under different water conditions (perennial hydrops, seasonal hydrops, perennial dry areas) was measured by LI-8100 soil carbon flux automatic measurement system, and the diurnal variation of soil respiration was analyzed. Seasonal variation and its relationship with soil temperature and soil volume water content. The results showed that: (1) the diurnal variation of soil respiration rate in the alpine wetland of Bayinbrook Swan Lake under different water conditions showed obvious single peak curve, perennial hydrops and seasonal hydrops. The maximum soil respiration rate in dry area was 1.97 ~ 7.39 渭 mol/ (m ~ 2 s),) at 13: 00-15: 00; The diurnal cumulative emissions of soil CO2 varied significantly (P0.01), and the maximum values of the three levels were 0.120.45 and 0.40 mol/m2, respectively, which significantly inhibited soil respiration. The soil carbon stability was improved. 2 the soil respiration rate was positively correlated with soil temperature and volumetric water content under different water conditions (P0.01), and there was no significant correlation between soil respiration rate and soil temperature (P0.01). The Q10 (soil respiration temperature sensitivity) of seasonal hydrops and perennial dry areas was significantly different (P0.01), and its size was as follows: perennial dry area (1.54), perennial hydrops area (2.22) and seasonal stagnant area (3.36). The Q10 of the typical days in June was the highest in each water area, showing that the seasonal water accumulation area (4.30) was perennial dry area (2.56), and the seasonal water accumulation area (4.75). The results showed that soil respiration in Q10.3 Bayinbrook Swan Lake alpine wetland was significantly affected by soil temperature (T) at 5 cm underground and soil volume water content (W) at 0 5 cm. The optimum fitting model Rs=-1.113 0.041W-0.366T 0.008 WTbetween soil respiration rate and soil respiration rate in seasonal hydrops and Rs=1.470 0.023W-0.027T 0.002 WT2 in perennial dry area were satisfied.
【作者单位】： 新疆农业大学草业与环境科学学院新疆土壤与植物生态过程重点实验室;
【基金】：新疆农业大学草业科学国家重点学科项目(XJCYB-2012-02) 国家自然科学基金项目(41305136)
【分类号】：S151.9
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