秸秆还田与水氮调控对土壤养分的影响  

Effects of straw returning and water-nitrogen regulation on soil nutrients

作　　者：王忠波 董海丽[1] 郑文生 WANG Zhongbo;DONG Haili;ZHENG Wensheng(School of Water Conservancy and Civil Engineering,Northeast Agricultural University,Harbin 150030,China;Key Laboratory of Efficient Utilization of Agricultural Water Resources,Ministry of Agriculture and Rural Affairs,Northeast Agricultural University,Harbin 150030,China;Heilongjiang Provincial Hydraulic Research Institute,Harbin 150080,China)

机构地区：[1]东北农业大学水利与土木工程学院,哈尔滨150030 [2]东北农业大学农业农村部农业水资源高效利用重点实验室,哈尔滨150030 [3]黑龙江省水利科学研究院,哈尔滨150080

出　　处：《东北农业大学学报》2022年第2期20-26,90,共8页Journal of Northeast Agricultural University

基　　金：黑龙江省自然科学基金项目(LH2020E115)。

摘　　要：为揭示玉米秸秆全量还田与水氮调控对土壤养分的影响,采用尼龙网袋法研究秸秆还田结合水氮调控土壤养分及秸秆腐解率。结果表明,秸秆全量还田时,水氮调控可显著提升秸秆腐解率,施氮较不施氮秸秆腐解率高。秸秆还田与水氮调控还可增加土壤养分含量,在培养周期内,全氮,有机碳均呈先升后降趋势,且同一给水条件下,施氮量越大,土壤有效磷和有机碳含量越高,在土壤水分为70%~90%时施氮量越大,土壤全氮含量越高;全磷含量在培养周期内无明显变化,但同一给水条件下,施氮量越大,土壤全磷含量越高。秸秆腐解率与全氮呈极显著正相关,与有效磷和有机碳呈极显著负相关,表明秸秆腐解率在一定程度上可反映土壤化学性质变化规律。研究可为秸秆还田条件下玉米水氮管理提供理论参考和依据。In order to reveal the effects of the total corn straw returning and water and nitrogen regulation on soil nutrients, the nylon net bag method was used to study the effects of straw returning combined with water and nitrogen regulation on soil nutrients and straw decomposition rate. The results showed that under the control of water and nitrogen, the decomposition rate of straw was significantly increased, and the decomposition rate of straw with nitrogen was higher than that without nitrogen. The total nitrogen and organic carbon increased first and then decreased during the cultivation period. Under the same water supply condition, the higher the amount of nitrogen application, the higher the available phosphorus and organic carbon contents. When the soil water content was 70%-90%, the higher the nitrogen application rate was, the higher the soil total nitrogen content was. The total phosphorus content showed no obvious change trend during the culture period, but under the same water supply condition, the higher the nitrogen application amount, the higher the total phosphorus content. The decomposition rate of straw was positively correlated with the total nitrogen and negatively correlated with available phosphorus and organic carbon, indicating that the decomposition rate of straw could reflect the change law of soil chemical properties to a certain extent. To sum up, the study was expected to provide some theoretical reference and basis for water and nitrogen management of maize under the condition of straw returning.

关 键 词：秸秆还田 水氮调控 秸秆腐解率 土壤养分 相关性 

分 类 号：S153[农业科学—土壤学]