不同施肥模式对潮土有机碳组分及团聚体稳定性的影响

生态学杂志 ›› 2005, Vol. ›› Issue (8): 887-892.

不同施肥模式对潮土有机碳组分及团聚体稳定性的影响

杨长明^1,2, 欧阳竹², 董玉红²

1. 同济大学环境科学与工程学院, 上海, 200092;
2. 中国科学院地理科学与资源研究所, 北京, 100101

收稿日期:2004-10-28 修回日期:2004-12-27 出版日期:2005-08-10
通讯作者: 杨长明,男,1973年生,副教授.主要从事土壤和湿地环境退化过程及其机理方面的研究,发表论文15篇,其中被SCI收录4篇.E-mail:cmyang@mail.tongji.edu.cn.
基金资助:
国家重点基础研究发展项目“973”前期专项(2003CCB001);同济大学王里科基金资助项目(TJLK0417).

Organic carbon fractions and aggregate stability in aquatic soil under different fertilization

YANG Changming^1,2, OUYANG Zhu², DONG Yuhong ²

1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Received:2004-10-28 Revised:2004-12-27 Online:2005-08-10

摘要/Abstract

摘要： 作为土壤质量的重要指标,土壤有机碳及其组分在土壤许多物理、化学和生物特性中发挥着重要作用。在田间条件下,通过对7种肥料结构组合处理下的土壤进行采样和分析,系统地研究和比较了不同养分模式对华北平原潮土土壤有机碳组分和土壤团聚体稳定性的影响。结果表明,与单施化肥处理(NPK)比较,NPK+S和NPK+M处理显著增加土壤耕作层(0～20cm)的总有机碳(TOC)和总氮(TN)含量。PK和CK处理的土壤TOC和TN较试验前土壤皆有明显下降。有机无机肥配施,明显增加土壤易氧化有机碳(EOC)、颗粒有机碳(POC)、轻组有机碳(LFOC)和水溶性有机碳(WSOC)。特别是与NPK处理相比较,NPK+M处理的土壤EOC、POC、LFOC和WSOC含量分别增加23.8%、39.9%、42.5%和32.1%。土壤耕作层中微生物生物量碳(MBC)和可矿化碳(MNC)以有机无机肥配施为最高,NPK处理次之,PK处理和CK最小。有机无机肥配施处理还明显增加了土壤>250μm水稳性团聚体(WSA)含量,并降低了土壤粘粒分散率(CDR)。相关分析表明,土壤>250μm水稳性团聚体(WSA)含量与所测定的有机碳组分含量皆呈明显正相关,特别是POC、LFOC和MBC与WSA达到极显著相关,相关系数分别为0.89、0.81和0.78;CDR与TOC、POC和LFOC皆呈显著负相关,相关系数分别为-0.70、-0.78和-0.73。

关键词: 饲用黑麦, 分蘖动态, 积温, 种植密度, 均匀设计

Abstract: As an essential indicator of soil quality,soil organic carbon (SOC) and its fractions play an important role in many soil chemical,physical,and biological properties.A field experiment was conducted to determine the effects of different nutrient regimes on aquatic soil organic carbon fractions and aggregate stability in Northern China Plain.Seven nutrient regimes were installed:(i) control,(ii) NP,(iii) NK,(iv)PK,(v)NPK,(vi) NPK+S (wheat straw),(vii) NPK+M (farmyard manure).The results showed that soil total organic carbon (TOC) and total nitrogen (TN) were markedly higher in combined application of organic and chemical fertilizers than in chemical fertilization.By fractionalizing SOC,it was observed that in comparing with treatment NPK,treatment NPK+M had significantly higher soil easily-oxidizable C (EOC),particulate organic C (POC),light fraction organic C (LFOC) and water-soluble organic C (WSOC),being increased by 23.8%,39.9%,42.5% and 32.1%,respectively.The proportions of LOC,POC,LFOC and WSOC to TOC in chemically fertilized soil,especially in treatment PK,were observably lower than those in organically fertilized soil.Incorporation of organic sources into aquatic soil showed the highest microbial biomass C (MBC) and mineralizable organic C (MNC),followed by treatments NPK,NP and NK,and treatments PK and CK had the lowest MBC and MNC.A combined application of organic and inorganic fertilizers increased the content of > 250 μm water stable aggregate (WSA) significantly (P<0.05),but decreased the clay dispersion rate (CDR).Correlation analysis showed that WSA was significantly (P<0.01 or P<0.05) and positively related to the determined organic fractions,and positively related to LFOC,POC and MBC,with the correlation coefficient r=0.87^**,0.92^** and 0.84^**,respectively.There were significantly negative correlations of clay dispersed rate (CDR) to TOC,POC and LFOC,with r=-0.70^*,-0.78^* and -0.73^*,respectively.

Key words: Forage rye, Tillering dynamics, Accumulated temperature, Planting density, Equal design method

中图分类号:

S158.3

杨长明, 欧阳竹, 董玉红. 不同施肥模式对潮土有机碳组分及团聚体稳定性的影响[J]. 生态学杂志, 2005, (8): 887-892.

YANG Changming, OUYANG Zhu, DONG Yuhong . Organic carbon fractions and aggregate stability in aquatic soil under different fertilization[J]. cje, 2005, (8): 887-892.

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