摘要
【目的】准确掌握宿根甘蔗土壤孔隙的变化特征,为甘蔗种植中的土壤管理、土壤水文预测预报等提供依据。【方法】采用空间代替时间法结合土壤水分穿透曲线法测定了不同坡度、不同宿根年限、不同土层的甘蔗地土壤大孔隙。【结果】宿根甘蔗地40 cm深土壤大孔隙半径分布在0.3~3.6 mm,随着孔径的增大,土层深度的增加,大孔隙数量显著减少;随着坡度和年限的增加,小于0.6 mm的大孔隙数量减少得更显著;土壤大孔隙平均半径最大为种植后第4年,且年限间差异主要出现在坡地上;坡地大孔隙面积比和平均体积呈现出随着宿根年限增加其值减小的趋势。【结论】甘蔗地宿根管理下,深层及小孔径大孔隙数量减少是主要趋势,应加强深施肥或原位松土管理。
【Objective】Accurately understanding the variation characteristics of soil pores of ratoon sugarcane fields would provide the basis for soil management,soil hydrological forecasting and prediction in sugarcane cultivation.【Method】The soil macropores of sugarcane fields with varying slopes,ratoon years and soil layers were determined using spatial instead of temporal method combined with soil water breakthrough curve method.【Result】The results showed that the macropore radius of 40 cm deep soil in ratoon sugarcane field ranged from 0.3 to 3.6 mm.In addition,with the increase of pore size and soil depth,the number of macropores decreased significantly.Furthermore,with the increase of slope and ratoon year,the number of macropores<0.6 mm decreased more significantly.The average radius of soil macropores reached the largest in the fourth year after planting,and the difference of the average radius between years mainly appeared on the slope field.The area ratio and average volume of macropores in slope field showed a decreasing trend with the increase of ratoon years.【Conclusion】Under the ratoon management of sugarcane field,the number of deep and small size pores tends to decrease,thus the management of deep fertilization or in-situ soil loosening should be strengthened.
作者
张铃悦
马建刚
赵彤辉
ZHANG Lingyue;MA Jiangang;ZHAO Tonghui(College of Ecology and Environment,Southwest Forestry University,Kunming 650224,China)
出处
《四川农业大学学报》
CSCD
北大核心
2024年第2期422-429,共8页
Journal of Sichuan Agricultural University
基金
国家重点研发计划项目(2022YFF130290505-05)
西南林业大学博士科研启动基金(202220050049)。
关键词
滇西南
宿根甘蔗
土壤大孔隙
水分穿透曲线
Southwest Yunnan
ratoon sugarcane
soil macropores
water breakthrough curve
