种还分离模式下玉米秸秆还田对土壤磷有效性及其有机磷形态的影响

发布时间：2018-05-01 15:41

本文选题：玉米秸秆 + 种还分离　；参考：《水土保持学报》2017年01期

【摘要】：采用尼龙网袋法对种还分离模式下的玉米秸秆还田进行田间原位模拟,比较不同秸秆还田量在不同还田深度下对土壤全磷、速效磷和不同形态有机磷的影响。试验设置4个水平秸秆添加比例R0(0%)、R1(0.44%)、R2(0.88%)、R3(1.32%)和3个不同还田深度0—15,15—30,30—45cm交叉处理。结果表明,秸杆还田1a后,各土层中土壤全磷含量随秸秆还田量的增加均无显著改变;在0—15cm土层中,与R0相比,R1、R2、R3处理下的土壤速效磷分别增加了27.0%,49.3%,64.1%,在15—30cm和30—45cm土层速效磷随着秸秆还田量的增加也呈显著增加,增加量大小依次为0—15cm15—30cm30—45cm;有机磷组分在0—15cm土层中表现为,相比于R0,R1、R2、R3处理的活性有机磷和高稳定性有机磷含量无显著差异,中等活性有机磷分别减少了12.8%,26.2%,36.3%,中稳定性有机磷分别增加了25.1%,53.5%,61.6%,15—30cm和30—45cm土层各有机磷组分含量变化也均表现为随着秸秆还田量的增加,中等活性有机磷含量升高,中稳定性有机磷含量降低,活性有机磷和高稳定性有机磷无显著差异。研究表明,种还分离模式下的玉米秸秆还田主要通过促进土壤其它形态的磷转化为速效磷而增加土壤速效磷含量,为下季作物提供可以直接吸收利用的磷源,同时提高了土壤中稳定性有机磷的含量,降低了中等活性有机磷的含量。
[Abstract]:In situ simulation of maize straw returning under seed separation model was carried out by using Nilon net bag method. The effects of different straw returning amount on soil total phosphorus, available phosphorus and organic phosphorus in different forms were compared under different returning depth. In the experiment, four levels of straw ratio (R0 / R1 / 0.44) and three different returning depths (0-1515-30 ~ 30-45cm) were set up to deal with the cross treatment of 0.88R2 and 0.88R3 / 1. 32cm) and 3 different depth of returning to the field, 0 ~ 1515 ~ 30 ~ 30 ~ 30 ~ 45 cm, respectively. The results showed that the soil total phosphorus content in each soil layer did not change with the increase of straw returning amount 1 year after straw returning to the field, but in 0-15cm soil layer, Compared with R0, the available phosphorus in the soil treated with R1 + R2 + R3 increased by 27.0 and increased by 49.3% and 64.1%, respectively. The available phosphorus in the soil layer of 15-30cm and 30-45cm also increased significantly with the increase of the amount of straw returning to the field. The increasing amount was 0-15cm15-30cm30-45cm, and the content of organophosphorus in 0-15cm soil layer showed no significant difference compared with that of R0 ~ (1 +) R1 ~ (2 +) R2N ~ (3) treatment, and the content of high stable organophosphate was not significantly different from that of R0 ~ (1 +) R1 ~ (2 +) treatment. The organic phosphorus content of medium active organic phosphorus decreased by 12.8 and 26.2and 36.3.The organic phosphorus content of medium stable organic phosphorus increased 25.1and 53.55.53.5respectively, and the changes of organic phosphorus components in 30-45cm soil layer 15-30cm and 30-45cm soil layer also showed that with the increase of straw returning amount, the content of moderately active organic phosphorus increased, and the organic phosphorus content of medium active organic phosphorus increased with the increase of straw return to the field. The content of medium stable organophosphorus decreased, but there was no significant difference between active organophosphorus and high stable organophosphorus. The results showed that the return of maize straw to field could increase the content of soil available phosphorus by promoting the transformation of other forms of phosphorus into available phosphorus, which could be directly absorbed and utilized by the next crop. At the same time, the content of stable organic phosphorus in soil was increased and the content of moderately active organic phosphorus was decreased.
【作者单位】：吉林农业大学资源与环境学院;
【基金】：吉林省科技厅重点基金项目(LFGC14213) 科技部丰粮工程项目(2012BAD04B02)
【分类号】：S153.6;S141.4

【参考文献】