不同水肥处理对辣椒保护地土壤温度和CO_2含量的影响

Effects of Irrigation and Fertilization on Temperature and CO_2 Content of Greenhouse Soil

研究了吉林省龙井地区保护地不同水、肥(氮、磷)处理对土壤温度、CO2含量的影响,结果表明:灌水量、土壤湿度与各个土层土壤温度之间呈显著的负相关,但是由于土壤水分影响到土壤升温和保温两方面,在相同施肥量下,其综合作用的结果是,以灌水定额为为2水平(118.33 m3hm-2次-1)处理的土温最高;灌水定额最大的4水平处理土温最低;土壤湿度、温度与土壤中CO2含量都呈极显著的正相关;低量氮肥和高量磷肥可使土壤中CO2含量增加;通过灌水、氮肥、磷肥的三因素四水平的水肥耦合实验研究发现,水、氮、磷处理均为3水平的处理辣椒产量最高;若在此处理水平上提高灌水量或施磷肥量都会使辣椒产量降低,而土壤中CO2含量却升高明显。

The coordination between water, air and temperature in soil is very important for soil fertility, especially in the northeast of China, We studied the effects of irrigation and fertilizer on the temperature and CO2 content of greenhouse soil, Our result showed that there was significantly negative correlation between irrigation and temperature in different soil layers. The temperature was the highest in soil treated with level 2 of irrigation quantity（ 118.33 m^3·hm^-2·time^-1 ）, There was significantly positive correlation between the quantities of irrigation or moisture and CO2 content in soil. Nitrogen and phosphorus fertilizers also indirectly affected the CO2 content in soil. Soil CO2 content increased in the soil treated with higher quantity of phosphorus or lower quantity of nitrogen fertilizer, In this experiment, the capsicum yield of the treatment with irrigation and fertilization at 3 levels was the highest. From this treatment level , the capsicum yield decreased and CO2 content in soil increased markedly by continuously increasing irrigation quantity or phosphorus fertilizer.