资源科学 ›› 2016, Vol. 38 ›› Issue (7): 1246-1253.doi: 10.18402/resci.2016.07.06

• • 上一篇    下一篇

长期不同施肥下新疆灰漠土有机碳储量演变分析

许咏梅1(), 刘骅1,2, 王西和1,2   

  1. 1. 新疆农科院土壤肥料与农业节水研究所/绿洲养分与水土资源高效利用重点实验室,乌鲁木齐 830091
    2. 国家灰漠土长期肥力与肥料效应监测站,乌鲁木齐 830091
  • 收稿日期:2015-12-10 修回日期:2016-06-16 出版日期:2016-07-25 发布日期:2016-07-25
  • 作者简介:

    作者简介:许咏梅,女,广东潮州人,博士,研究员,主要从事土壤肥力与培育研究。E-mail:xym1973@163.com

  • 基金资助:
    国家自然科学基金(41561070);国家科技支撑计划项目(2014BAC15B03)

Evolution analysis of soil organic carbon sequestration under long-term different fertilization of grey desert soil in Xinjiang

XU Yongmei1(), LIU Hua1,2, WANG Xihe1,2   

  1. 1. Institute of Soil and Fertilizer and Agricultural Sparing Water/key Laboratory of Oasis Nutrient And Efficient Utilization of Water and Soil Resources,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China
    2. National Gray Desert Soil Fertility and Fertilizer Effect Monitoring Station,Urumqi 830091,China
  • Received:2015-12-10 Revised:2016-06-16 Online:2016-07-25 Published:2016-07-25

摘要:

新疆灰漠土耕地面积176万hm2,为新疆农业的发展起关键支撑作用。本研究基于新疆灰漠土农田肥力长期监测试验,选择其中不施肥、施化肥和化肥配施有机肥、秸秆的六个处理,对不同施肥处理下土壤表层(0~20cm)和亚表层(20~40cm)土壤碳储量变化特征进行了研究。结果表明:长期不施肥或施用化肥、有机肥均能提高灰漠土表层和亚表层土壤有机碳储量,其中表层土壤有机碳储量提高(4.0~43.7)tC/hm2;亚表层土壤有机碳储量提高(9.0~49.5)tC/hm2。采用不同施肥措施,土壤有机碳储量累积存在时段差异,不施肥耗竭种植条件下在试验初始5年碳储量缓慢下降,但在其后的18年中逐渐升高,因此在肥力水平较低土壤上,即使不施肥但长期耕作也将提高土壤碳储量,有利于贫瘠土壤固碳。这一结果也表明,若采用短期试验观测的数据不能全面反映人为管理措施对土壤碳储量的长期影响,对于碳储量的研究适宜依托长期观测试验的平台来完成。与不施肥或长期施用化肥相比,采用有机无机配施使灰漠土有机碳碳储量提高了32.1%~152.7%,固碳效应显著。将分层土壤容重考虑在内的等质量土壤碳储量计算方法能够较为客观评估秸秆还田的固碳效应。

关键词: 长期施肥, 新疆灰漠土, 有机碳储量, 演变

Abstract:

With a cropping area of 1.76 million hectares, grey desert soil(hapliccalcisol)is crucial for agricultural development in Xinjiang in northwest China. The objective of our experiment was to study the effect of different fertilization on carbon sequestration based on a long-term experiment station of grey desert soil. There were six treatments:no fertilization,chemical fertilization,chemical fertilization plus manure and chemical fertilization plus straw returned to the soil(CK,NP,NPK,NPKM,hNPKM,NPKS). The characteristics of soil organic carbon (SOC)sequestration in surface(0~20cm)and subsurface(20~40cm)layers of desert soil were studied from 1989-2011. We found that the SOC stock was improved under all treatments including no fertilizer,chemical fertilizer,and manure fertilizer plots. The SOC stock was elevated by(4.0~43.7)tC/hm2 in the surface layer and(9.0~49.5)tC/hm2 in the subsurface layer. The SOC stock differed across time periods among plots. The SOC stock decreased during the first 5 years and increased slightly during the latter 18 years in the no fertilizer plot. This indicates that the SOC can be sequestrated in relative low fertility soil even with no fertilizer application in arable land. This result also implies that the effect of management on SOC stock can be illustrated based on long term experimentation. SOC stock under the manure plot was increased by 32.1%~152.7% compared with the no fertilizer and chemical only plots. Take into consideration of the layered soil bulk density and quality of soil carbon reserves calculation method can evaluate the carbon sequestration of straw returned objectively.

Key words: long-term fertilization, grey desert soil of Xinjiang, soil organic carbon sequestration, evolution