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2010年10-12月,在水稻田休闲期内,采用动态密闭气室法,研究了湖南省亚热带红壤区3种土地利用方式(耕地、休耕地、荒地)的土壤呼吸变化特征及其影响因素。结果表明耕地、休耕地和荒地的土壤CO2呼吸值分别为1.87±0.78μmol/m2.s、1.33±0.05μmol/m2.s、1.16±0.01μmol/m2.s。不同土地利用方式土壤呼吸日变化均表现出明显的单峰型特征。不同土地利用方式土壤呼吸均与土壤温度、大气温度显著正相关,而与土壤湿度显著负相关。对不同土地利用方式建立温度、水分与土壤呼吸速率的双变量关系模型,结果发现双变量模型优于传统温度敏感性模型,能够更好地描述耕地和休耕地的土壤呼吸变异性。
During the leisure period of paddy field from October to December in 2010, the characteristics of soil respiration and its influencing factors of three kinds of land use patterns (cultivated land, fallow land and wasteland) in subtropical red soil area of Hunan Province were studied by dynamic confined gas chamber method. . The results showed that soil CO2 respiration values of cultivated land, fallow land and wasteland were 1.87 ± 0.78μmol / m2.s, 1.33 ± 0.05μmol / m2.s and 1.16 ± 0.01μmol / m2.s, respectively. The diurnal variations of soil respiration in different land use patterns all showed obvious unimodal characteristics. Soil respiration of different land use patterns was significantly and positively correlated with soil temperature and atmospheric temperature, but negatively correlated with soil moisture. Based on the bivariate relation model of temperature, moisture and soil respiration rate, we found that the bivariate model is better than the traditional temperature-sensitivity model and can better describe the soil respiration variability on arable land and fallow land.