Characteristics of Soil Organic Carbon Fractions of Alfalfa Soils in the Minqin Oasis

GENG Yanxiang1; WANG Li1; YANG Caihong1; WANG Junqiang2; ZHAO Xu2

doi:10.13870/j.cnki.stbcxb.2017.02.030

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Characteristics of Soil Organic Carbon Fractions of Alfalfa Soils in the Minqin Oasis

更新时间：2024-11-07

- Characteristics of Soil Organic Carbon Fractions of Alfalfa Soils in the Minqin Oasis
- Vol. 31, Issue 2, Pages: 177-183(2017)
- 作者机构：
  
  1. 甘肃农业大学林学院,兰州,730000
  2. 甘肃省农业工程技术研究院,甘肃,武威,733006
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.02.030
  CLC： S551+.7;S153.6+21
- Published：2017
- 稿件说明：
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GENG Yanxiang1, WANG Li1, YANG Caihong1, et al. Characteristics of Soil Organic Carbon Fractions of Alfalfa Soils in the Minqin Oasis[J]. 2017, 31(2): 177-183.
DOI：

GENG Yanxiang1, WANG Li1, YANG Caihong1, et al. Characteristics of Soil Organic Carbon Fractions of Alfalfa Soils in the Minqin Oasis[J]. 2017, 31(2): 177-183. DOI： 10.13870/j.cnki.stbcxb.2017.02.030.

摘要

为了解西北民勤绿洲区紫花苜蓿种植后土壤有机碳及其组分的变化趋势及影响因素，以民勤绿洲区3 a(A3)、14 a(A14)和22 a(A22)苜蓿种植地为研究对象，以棉花种植地(CK)为对照，通过野外调查取样以及室内测试分析，对土壤中的全部有机碳(TOC)、重组有机碳(HFOC)、轻组有机碳(LFOC)、颗粒有机碳(POC)和微生物量碳(MBC)的含量进行测定，分析变化趋势并对其规律进行研究。结果表明：相对于棉花种植地，22 a苜蓿地土壤容重和电导率分别降低了13.9%和95.4%。3～22 a苜蓿地较棉花种植地(CK)的TOC、LFOC、HFOC和MBC分别表现出175.0%，1416.0%，47.8%和216.0%的增长幅度，变化差异较为显著。在垂直剖面上，棉花种植地(CK)显著低于苜蓿地LFOC、POC、MBC含量，并随土层加深而不断降低。逐步回归分析表明LFOC与TOC显著正相关(p＜0.05)。苜蓿种植年限、土层以及这两个变量的交互作用对POC/TOC产生显著影响(p＜0.01)，对TOC、LFOC、HFOC、POC、MBC、LFOC/TOC、HFOC/TOC和MBC/TOC均产生极显著影响(p＜0.001)。苜蓿种植提高了土壤质量，降低了土壤容重和盐碱性，连续种植14 a是苜蓿的最为合理的种植年限，同时苜蓿种植有利于0—60 cm垂直土层有机碳组分的累积，尤其对TOC、LFOC和MBC的增长效果极其显著。

Abstract

A study was conducted in Minqin Oasis of wuwei city in North-West China to understand the trend of soil organic carbon fractions and its influencing factors after several years of alfalfa planting in the Minqin Oasis. Three treatments were conducted

including 3 years (A3)

14 years (A14) and 22 years (A22) continuous cropping of alfalfa. Content of total organic carbon (TOC)

heavy fraction organic carbon (HFOC)

light fraction organic carbon (LFOC)

particulate organic carbon (POC)

and microbial biomass carbon (MBC) in the soil were determined through field survey sampling and indoor laboratory analysis. The results showed that soil bulk density and electrical conductivity of 22 years alfalfa soil decreased by 13.9% and 95.4%

respectively

compared with that of cotton soil. Compared with the cotton soil (CK)

the TOC

LFOC

HFOC

and MBC of 3 years

14 years and 22 years alfalfa soil was significantly increased by 175.0%

1 416.0%

47.8%

and 216.0%

respectively. Vertical profile of cotton soil showed that content of LFOC

POC

MBC decreased with the increase of soil depth. Stepwise regression analysis showed that there was a significant positive correlation between LFOC and TOC (p＜0.05). Alfalfa planting age

soil layer and their interaction had a significant impact on POC/TOC (p＜0.01)

and an extremely significant effect on TOC

LFOC

HFOC

POC

MBC

LFOC/TOC

HFOC/TOC

and MBC/TOC (P＜0.001). Alfalfa planting could improve soil quality and reduce soil bulk density and salinity. The study revealed that continuous planting for 14 years is the most reasonable planting time for Alfalfa. Meanwhile

Alfalfa planting is beneficial to the accumulation of organic carbon fractions in the 0—60 cm soil layer

especially to the increase of TOC

LFOC

and MBC.

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