中国农业科学 ›› 2020, Vol. 53 ›› Issue (18): 3729-3740.doi: 10.3864/j.issn.0578-1752.2020.18.009

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

免耕对农田土壤持水特性和有机碳储量影响的区域差异

李婧妤1,2(),李倩2,3,武雪萍2,吴会军2(),宋霄君2,张永清1(),刘晓彤2,丁维婷2,张孟妮2,郑凤君2   

  1. 1山西师范大学地理科学学院,山西临汾 041000
    2中国农业科学院农业资源与农业区划研究所,北京 100081
    3首都师范大学资源环境与旅游学院,北京 100048
  • 收稿日期:2020-04-29 接受日期:2020-07-09 出版日期:2020-09-16 发布日期:2020-09-25
  • 通讯作者: 吴会军,张永清
  • 作者简介:李婧妤,E-mail: lijingyu0809@126.com
  • 基金资助:
    国家重点研发计划(2016YFD0300804);国家重点研发计划(2018YFD0200408);中央级公益性科研院所基本科研业务费专项(1610132019034);中央级公益性科研院所基本科研业务费专项(1610132019033)

Regional Variation in the Effects of No-Till on Soil Water Retention and Organic Carbon Pool

LI JingYu1,2(),LI Qian2,3,WU XuePing2,WU HuiJun2(),SONG XiaoJun2,ZHANG YongQing1(),LIU XiaoTong2,DING WeiTing2,ZHANG MengNi2,ZHENG FengJun2   

  1. 1College of Geographical Sciences, Shanxi Normal University, Linfen 041000, Shanxi
    2Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081
    3College of Resource Environment and Tourism, Capital Normal University, Beijing 100048
  • Received:2020-04-29 Accepted:2020-07-09 Online:2020-09-16 Published:2020-09-25
  • Contact: HuiJun WU,YongQing ZHANG

摘要:

【目的】分析耕作对土壤碳储量的影响,明确我国东北、华北地区的科学耕作方式,为区域优化耕作模式、改善土壤提供依据。【方法】基于吉林公主岭(GZL)、山西寿阳(SSY)、河北廊坊(HLF)、山西临汾(SLF)4个长期定位试验,选择传统耕作(CT)、免耕(NT)两个耕作处理,分析耕作对有机碳影响的区域差异。【结果】(1)免耕对土壤容重和紧实度影响存在区域性差异,显著提高了东北冷凉区黏质黑土(公主岭)和华北砂质潮土(廊坊)的土壤容重和紧实度,土壤容重分别增加了12.1%、0.7%,但降低了黄土高原东部粉砂壤质黄土(临汾)和砂壤质褐土(寿阳)的土壤容重和紧实度,土壤容重分别降低了1.5%、8.2%。(2)公主岭试验点0、10 kPa土壤体积含水量处理间差异显著,免耕较传统耕作分别提高了40.4%、30.1%;寿阳试验点0、10、500 kPa下免耕较传统耕作土壤体积含水量分别降低了6.4%、4.3%、5.9%,350 kPa下提高了2.1%;廊坊试验点10、350、500 kPa免耕下土壤体积含水量分别提高了0.6%、5.6%、2.6%;临汾试验点0和10 kPa免耕下土壤体积含水量分别降低了7.1%、5.5%,350 和500 kPa土壤体积含水量分别提高了2.9%、8.9%。(3)在4个区域,免耕显著提高了0—10 cm表层土壤有机碳储量,其中公主岭增加最显著,提高了45.4%;但免耕对0—80 cm土层总有机碳储量影响存在区域性差异,公主岭提高了7.2%,寿阳、廊坊、临汾分别降低了26.8%、31.3%、23.5%。(4)土壤有机碳与饱和含水量呈极显著正相关关系,而与年均温、年降水、紧实度具有显著负相关关系,有机碳储量受气候因子、持水能力、紧实度的影响显著。【结论】由于我国东北和华北地区气候、作物类型、土壤性质等不同,免耕对土壤有机碳储量影响存在区域性差异,可以显著提高各区域表层土壤有机碳储量,但仅提高了东北冷凉区黏质黑土(公主岭)土壤总有机碳储量。总体来说,免耕保护性耕作技术是提高表层有机碳储量的有效途径。

关键词: 免耕, 土壤有机碳, 土壤物理性质, 水分特征曲线, 区域

Abstract:

【Objective】Soil tillage is an important factor which affecting soil organic carbon, but the impact of tillage on soil organic carbon and the driving factors in different regions are still unknown. In this study, the regional variation in the effects of no-till on soil water retention and organic carbon pool were studied to improve regional soil tillage in the north of China. 【Method】The four typical long-term tillage experiments were selected, which was located in Shouyang (SSY) and Linfen (SLF) of Shanxi Province, Gongzhuling (GZL) of Jilin Province and Langfang (HLF) of Hebei Province. Two tillage treatments, including conventional tillage (CT) and no-till (NT) , were selected to study the effects of tillage on organic carbon. 【Result】 (1) Soil bulk density and penetrometer resistance were significantly affected by no-tillage in different regions. Compared with CT, NT significantly increased the bulk density in black soil (GZL) and sandy soil (HLF), which was increased by 12.1% and 0.7%, respectively. But CT reduced the bulk density in fluvo-aquic soil (SLF) and cinnamon soil (SSY), which was decreased by 1.5% and 8.2%, respectively. (2) The soil water content of 0 and 10 kPa under NT in black soil (GZL) was significantly different, which were increased by 40.4% and 30.1%, respectively; the soil water content of 0, 10 and 500 kPa under NT in cinnamon soil (SSY) was reduced by 6.4%, 4.3%, and 5.9%, respectively, and which was increased by 2.1% at 350 kPa. The soil water content of 10 kPa, 350 kPa, and 500 kPa under NT in sandy soil (HLF) were increased by 0.6%, 5.6%, and 2.6%, respectively. The soil water content of 0 and 10 kPa under NT in fluvo-aquic soil (SLF) decreased by 7.1% and 5.5%, respectively, and the soil water content of 350kPa and 500kPa was increased by 2.9% and 8.9%, respectively. (3) Soil organic carbon was affected by no-tillage in different regions. Compared with CT, NT significantly increased the organic carbon storage in 0-80 cm layer in black soil (GZL); in cinnamon soil (SSY), fluvo-aquic soil (SLF) and sandy soil (HLF), NT decreased soil organic carbon storage by 26.8%, 31.3%, and 23.5%, respectively. (4) Soil organic carbon stocks were positive correlated with altitude and saturated moisture, which was negatively correlated with annual average temperature, annual precipitation, and penetrometer resistance. This showed that organic carbon storage was significantly affected by climatic factors, soil water retention and penetrometer resistance. 【Conclusion】No-tillage changed soil organic carbon stocks by affecting penetrometer resistance and soil water retention. However, due to differences in climate, crop and soil factors in northeast and north of China, the increase in soil organic carbon stocks was different. In general, conservation tillage was an effective way to increase the surface soil organic carbon storage.

Key words: no-tillage, soil organic carbon, soil physical properties, soil water characteristic curve, region