物理性环境因素对淮北地区杨树人工林土壤呼吸的影响

以河南西平县杨树人工林为研究对象，对环境因素与土壤呼吸之间的关系进行了研究。结果表明，土壤呼吸与各环境因子之间均显著相关，其中主要的影响因素为土壤温度（ Soil＿T）、空气温度（ Ta）和土壤含水量（ Soil＿VWC）等，土壤呼吸与空气温度呈指数关系，且随着空气温度的升高土壤呼吸逐渐增加；不同层（5 cm、20 cm、45 cm）的土壤温度与土壤呼吸变化趋势一致，土壤呼吸随着土壤温度的升高呈递增趋势，且二者最大值出现的时间一致；土壤含水量与土壤呼吸之间呈正相关关系，但二者之间相关系数并不高；土壤呼吸Q10（土壤温度每升高10℃时土壤呼吸增加的倍数）值为2.796。由此可见，土壤呼吸的主要影响因素为温湿度。

Effects of Physical Environmental Factors on Soil Respiration of Planted Poplar Forest in North Plain of Huaihe River

This paper studied relationship between the environmental factors and the soil respiration of the planted poplar forest in Xiping County of Henan Province.The results showed that： the soil respiration and various envi-ronmental factors were significantly related;soil temperature（ Soil_T） , air temperature （ Ta） and soil water content （ Soil_VWC） were the main influence factors affecting the soil respiration;it presented exponential relationship be-tween the soil respiration and the air temperature, and the soil respiration gradually increased with increase of the air temperature;it had the same variation tendency between the soil temperature of different levels （5 cm, 20 cm, 45 cm） and the soil respiration, and the soil respiration gradually increased with increase of the soil temperature, and both of the maximum value appeared at the same time;the soil water content was positively correlated with the soil respiration, but its correlation coefficient was not high;the Q10 （ the multiples of the soil respiration increased when the soil temperature raised every 10℃） of the soil respiration was 2.796; accordingly, the main influence factors of the soil respiration were the temperature and the moisture.