防渗透气沙与衬膜方法种植沙漠水稻哪个更节水

2025-04-05 11:11:24
推荐回答(1个)
回答(1):

第一种方法是传统的衬膜水稻技术,已经试验推广了十几年。经过多年的种植探索尝试,目前沙漠水稻种植技术手段更加完善。从以前衬膜铺设深度20公分~30公分改为现在铺设深度70公分~80公分,不仅增加了土地的含氧量也便于改用大型机械化耕作,也避免了对衬膜造成损坏。一次铺设可以连续使用15年左右。这种方法彻底解决了水的渗漏问题
另一种方法是透气防渗砂技术。透气防渗砂是通过“增强水的表面张力”原理,以沙漠风积沙为原料,研制开发出的一种具有呼吸功能的防渗材料。1厘米铺装厚度的透气防渗砂的防渗高度达2米以上,2米高水压下,渗透速率<0.3 kg/m2/h,略高于蒸发速率0.007kg/ m2/h。也就是说防渗沙不能彻底杜绝渗漏的问题,防渗沙的投入成本比衬膜技术要高一些
综合优缺点来看;防渗沙的优点是增加土壤的透气性,但是不能彻底防渗漏,投资成本高。衬膜水稻技术优点是彻底解决渗漏的问题,缺点是浅耕土壤的含氧性差,这个问题通过实践把深度增加解决了土壤含氧的问题。所以说沙区牧民更愿意使用衬膜水稻的技术

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