弃耕砂田造林地土壤水分生态研究

Study on Soil Water Ecological Process of Abandoned Sandy Afforestation Field

通过弃耕砂田人工造林试验,并且以相邻的农作物砂田和原生地裸地为对照,对弃耕砂田造林地土壤水分生态进行观测研究,结果表明：在整个观测期内,弃耕砂田灌木造林地0-40 cm层土壤含水量平均为12.6%,与农作物砂田、原生地裸地含水量相比,分别高出9.5%和40.7%,这说明弃耕砂田的保水效果虽较新砂田有所下降,但较原生地裸地仍具有较好的水分保持能力;在整个生长期内,弃耕砂田灌木造林地土壤水分变化虽有上下波动,但总体呈下降趋势,7月份达到最低。而经过8-9月雨季后,土壤含水量得到补充而快速增加;与对照相比,弃耕砂田灌木造林地土壤含水量在（0-10 cm）与农作物砂田和原生地裸地差异不大,但在10-40 cm层的土壤含水量均高于农作物砂田和原生地裸地。观测研究初步表明,弃耕砂田具有植被恢复与利用必要的水分基础条件。

Through artificial afforestation experiment,and setting crop sandy field and bare land as comparison,study on the soil water ecological process under abandoned sandy afforestation field.The results showed as follow,the average soil water content of abandoned sandy afforestation field was 12.6% within 40 cm in observation period,compared with bare land and sandy field,the soil water content of abandoned sandy afforestation field was higher respectively 9.5% and 40.7%.It showed that the water conservation effects of was worse than the new sandy field,but its water conservation benefit was much better than bare land.Although the change of the soil water content of abandoned sandy field was fluctuation,but the overall tendency was drops,and reached the minimum in July.After the rainy season from August to September,the soil water content increased rapidly with water supplement.Compared with the CK,there were no difference about soil water content in farming sandy field and bare land and abandoned sandy field within 10 cm,but that of it was higher than other two field.The observational and primary study showed that the abandoned sandy field has the necessary water condition for revegetation and using.