生物炭和无机肥对盐碱滩涂围垦农田土壤性状的影响

发布时间：2019-06-03 19:52

【摘要】：在重度盐碱滩涂围垦的土地上,添加不同量的生物炭(0、3、6、9 hm~(-2)),在玉米不同生育期施加无机肥,对照CK不施肥,研究土壤在不进行作物种植下的性状变化。结果表明:自然条件下重度盐碱土地土壤物理性状变差,施用无机肥加剧了土壤的退化程度;在未种植作物条件下,生物炭添加没有对降低土壤容重起到促进作用,同时也没有提高土壤饱和含水量及田间持水量;团聚体组成分析显示生物炭用量在3 t hm~(-2)时土壤中2 mm团聚体增加最多;雨季时雨水淋洗显著降低土壤0~20 cm土层盐分,生物炭用量越大土壤盐分淋洗效果越明显;八月份和九月份时随着雨季结束,地下水位升高、太阳辐射增强加速了盐分在表层土壤的积聚,生物炭添加能有效抑制盐分在表层的积累,但无机肥添加又阻碍了这种抑制作用。
[Abstract]:Different amounts of biochar were added to the land reclaimed by severe saline-alkali beach (0, 3, 6, 9 hm~ (- 2),) applied inorganic fertilizer at different growth stages of corn, and no fertilizer was applied to control CK. The changes of soil characters without crop planting were studied. The results showed that the physical state of soil in severe saline-alkali land became worse under natural conditions, and the application of inorganic fertilizer aggravated the degree of soil degradation. Under the condition of unplanted crops, the addition of biochar did not promote the reduction of soil bulk density, and did not increase the saturated soil water content and field water holding capacity. The analysis of agglomeration composition showed that the 2 mm aggregates in soil increased most when the amount of biochar was 3 t hm~ (- 2), and the salt content of 0 脳 20 cm soil layer was significantly decreased by Rain Water leaching in rainy season, and the more the amount of biochar was, the more obvious the leaching effect of soil salt was. In August and September, with the end of the rainy season, the groundwater level rose, the increase of solar radiation accelerated the accumulation of salt in the surface soil, and the addition of biochar could effectively inhibit the accumulation of salt in the surface layer. However, the addition of inorganic fertilizer hindered this inhibition.
【作者单位】：土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所);中国科学院烟台海岸带研究所;
【基金】：国家重点研发计划项目(课题)(2016YFD0200303);国家重点研发计划项目(课题)(2016YFC0501309) 国家科技支撑计划课题(2015BAD01B03) 中国科学院科技服务网络计划(STS计划)项目课题(KFJ-SW-STS-141-2) 江苏省农业科技自主创新资金项目(CX(15)1005) 国家自然科学基金面上项目(41571223) 南京土壤研究所“一三五”计划和领域前沿项目(ISSASIP1633)资助
【分类号】：S158

【相似文献】