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黄土高原半干旱丘陵山区覆膜、施氮肥和秸秆还田对土壤温度的影响

发表时间:2012-09-15  浏览量:886  下载量:276
全部作者: 王丽君,陈计玲,张峰,李凤民
作者单位: 兰州大学干旱与草地生态教育部重点实验室
摘 要: 在黄土高原半干旱丘陵区比较研究了覆膜、施氮肥和秸秆还田(播种前施入地表下5 cm)单独处理和组合处理对5 cm和20 cm处土壤温度的影响。结果表明:1) 大多数情况下土壤增温效果为,覆膜>秸秆还田>施肥,全膜覆盖>半膜覆盖>不覆膜,秸秆还田量1 500 kgC/hm2处理>秸秆还田量750 kgC/hm2处理>无秸秆还田处理;施氮肥对土壤温度无显著影响。2) 覆膜处理可以同时显著增加5 cm和20 cm处土壤温度,秸秆还田对土壤温度的显著影响集中在5 cm处,覆膜处理和秸秆还田显著增加土壤温度均发生于玉米抽雄期之前。3) 不覆膜与覆全膜相比,秸秆还田在前者条件下产生的增温效果更明显。4) 大气日均温和日平均土壤温度呈现显著相关,而线性相关度在不覆膜不施加秸秆时最高,并随着覆膜程度与秸秆量的增加而减小。
关 键 词: 生态学;土壤温度;大田试验;覆膜;秸秆还田
Title: Effects of plastic film mulch, nitrogen fertilizer and straw return on soil temperature in semi-arid hilly areas of Loess Plateau
Author: WANG Lijun, CHEN Jiling, ZHANG Feng, LI Fengmin
Organization: Key Laboratory of Arid and Grassland Ecology, Ministry of Education, Lanzhou University
Abstract: This paper compared the effects of plastic film mulch, nitrogen fertilization and straw return (applied at 5 cm below the soil surface before planting) on soil temperature at 5 cm and 20 cm below the soil surface. The results showed: 1) The trends of soil temperature effects are, plastic film mulch>straw return>nitrogen fertilization, full plastic film mulch>half plastic film mulch>no mulch, 1 500 kgC/hm2 amount of straw return>750 kgC/hm2 amount of straw return>no straw returning, applying nitrogen fertilization had no significant effects on soil temperature. 2) Plastic film mulch increased both soil temperature at 5 cm and 20 cm depth. Straw return basically increased temperature at 5 cm depth. 3) Straw return had bigger effect on temperature with no film mulch than with full plastic film mulch. 4) The mean of daily air temperature and soil temperature without applying plastic film and straw had the best linear correlation which decreased when the degree of plastic film mulch and the amounts of straw return increased.
Key words: ecology; soil temperature; field experiment; plastic film mulch; straw return
发表期数: 2012年9月第17期
引用格式: 王丽君,陈计玲,张峰,等. 黄土高原半干旱丘陵山区覆膜、施氮肥和秸秆还田对土壤温度的影响[J]. 中国科技论文在线精品论文,2012,5(17):1674-1683.
 
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