蓄水坑灌条件下不同肥液浓度对果园土壤呼吸影响及水热关系分析

n experiment was conducted to explore the effects of different levels of fertilizer solution concentration (nitrogen application rate) on the orchard soil respiration rate and on the factors which affecting the soil respiration, especially, soil moisture and soil temperature, under water storage pit irrigation. This article set three different fertilizer solution concentration levels, including 0g/L(N0)，0.749g/L(N1) and 1.248 g/L(N2) . Results indicate that average soil respiration showed an asymmetric unimodal curve change during orchard apple tree growth periods under water storage pit irrigation. Soil respiration increased with the increase of fertilizer solution concentration level. Maximum respiration rate was recorded in July and the minimum was recorded near to maturity stage. When fertilizer solution concentration was 1.248g/L, the pit wall of soil respiration rate under the condition of water storage pit irrigation was higher than that under the condition of surface irrigation. Soil temperature and soil moisture were the main influence factors of soil respiration rate. There was a significant positive correlation between 10 cm soil depth temperature and soil respiration. Within a certain range, soil respiration exponentially increased with the increase of soil temperature. Soil respiration was the result of the combination of soil temperature and soil moisture.