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为了探讨保护性耕作对旱作农田土壤呼吸的影响,采用LI6400-09呼吸室在重庆北碚西南大学试验农场对平作(T)、垄作(R)、平作+覆盖(TS)、垄作+覆盖(RS)这4种处理下的西南紫色土丘陵区小麦/玉米/大豆套作体系中小麦作物生长季节的土壤呼吸及其水热生物因子进行了测定和分析.结果表明,小麦生殖生长阶段农田土壤呼吸速率变化范围为1.100～2.508μmol.(m2.s)-1,各处理的土壤呼吸速率差异显著,表现为RS>R>TS>T.各处理10 cm土层的土壤温度表现为T>R>TS>RS.土壤呼吸与土壤温度的关系符合指数函数,Q10值分别为1.25、1.20、1.31和1.26.5 cm土层的土壤含水量高低排序为TS>RS>T>R.土壤水分与土壤呼吸以抛物线曲线拟合最好,说明存在土壤呼吸最强的土壤含水量点,本研究得出小麦生殖生长阶段在土壤含水量的响应阈值为14.80%～17.47%.土壤动物中优势类群为弹尾目和螨目,与土壤呼吸存在一定相关性,对照处理和垄作下相关性高,而秸秆覆盖的处理土壤呼吸与土壤动物没有明显的相关性.
In order to investigate the effect of conservation tillage on soil respiration in dry farmland, LI6400-09 respiration chamber was used to study the effects of conservation tillage on soil respiration in dry farmland. ) Soil respiration and hydrothermal biological factors of wheat crop growing season in wheat / corn / soybean intercropping system in southwest purple soil hilly region were measured and analyzed under the four treatments.The results showed that soil respiration The rate of soil respiration ranged from 1.100 to 2.508μmol. (M2.s) -1, and the soil respiration rate of each treatment was significantly different (RS> R> TS> T). The soil temperature at 10 cm soil depth was T> R > TS> RS. The relationship between soil respiration and soil temperature accorded with the exponential function. The soil water content at the Q10 values of 1.25, 1.20, 1.31 and 1.26.5 cm, respectively, was ranked as TS> RS> T> Soil respiration parabolic curve fitting best, indicating that there is the strongest soil respiration of soil moisture content point, the reproductive growth of wheat in this study reached the soil moisture content of the response threshold of 14.80% ~ 17.47% .The dominant species of soil animals were Eupolyphaga and mites, with soil respiration there Correlation, control and ridge correlation were high, while straw mulching treatments had no significant correlation with soil fauna.