长江流域资源与环境 >> 2010, Vol. 19 >> Issue (12): 1448-.

• 生态环境 • 上一篇    下一篇

三峡库区林地土壤有机碳含量特征及效应

王云琦|王玉杰   

  1. (北京林业大学水土保持学院|水土保持与荒漠化防治教育部重点实验室|北京 100083)
  • 出版日期:2010-12-20

CONTENT OF SOIL ORGANIC CARBON IN FOREST SOIL AND ITSEFFECTS IN THE THREE GORGES RESERVOIR AREA

WANG Yunqi|WANG Yüjie   

  1. (Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education|College of Soil and Water Conservation|Beijing Forestry University|Beijing 100083,China)〖
  • Online:2010-12-20

摘要:

对三峡库区典型林分林地土壤有机碳(SOC)含量特征及对土壤物理性质、土壤结构和土壤养分效应进行研究,以期为三峡库区生态环境建设提供依据。结果表明:SOC含量表现为表层(A层)土壤(12.06~45.18 g/kg)明显大于下层土壤,大一个数量级。从土壤表层到底层,SOC含量呈明显下降趋势。由相同立地条件的灌木林改造而来的农地土壤(改造年限8 a)各层土壤SOC含量都有所降低,土壤表层SOC含量降低了10%,土壤平均有机碳含量降到为灌木林地的66%。三峡库区SOC含量与土壤物理性质直接相关,SOC含量与土壤容重和土壤毛管孔隙度存在最为明显的线性关系〖WTBX〗(R2=0.83,0.83,n=19,p<0.01)。土壤有机碳直接参与了土团聚体的形成,SOC含量与土壤团聚度和土壤团聚状况均有较好的相关关系(R2=0.62,0.76,n=19,p<0.01)。各林地土壤中氮元素含量最高,速效氮含量约为速效磷的6倍,为速效钾的2.5倍。SOC与土壤主要营养元素(N,P,K)关系中,对N元素作用最明显,特别是速效氮〖WTBX〗(R2=0.66,n=19,p<0.01),对磷的矿化起主要作用,与钾元素关系不明显。土壤有机碳是决定N和P矿化的主导因子,从土壤表层到底层C/N比值呈下降趋势,C/P值约为C/N值的6倍。阳离子交换量(CEC)与土壤团聚度之间有明显的相关关系〖WTBX〗(R2=0.49,n=19,p<0.01〖WTBZ〗)。SOC对CEC的作用主要通过改变土壤结构而实现。

Abstract:

In the Three Gorges Reservoir areas,the typical forest types were selected to study the soil organic carbon (SOC) and its effects on soil physical properties, soil structure,and soil nutrients,which will benefit the ecoenvironment protection.The forest soil samples were collected according to soil genetic horizons.The content of SOC in A horizon(12.06~45.18 g/kg) was obviously larger than that in the lower horizons,over one quantitative grade.The content of SOC from top soil layer to bottom layer descended quickly.The arable land was reconstructed from shrub forest.Though the arable land has the same site with shrub forest,the content of SOC was less than that in shrub forest land after eight years cropping management.The content of SOC in A horizon in arable land decreased 10% compared to shrub forest soil,and the average content of SOC only accounted for 66% of shrub forest soil.The content of SOC had the direct effects on soil physical properties. There were obvious positive linear correlation between content of SOC and soil density and soil capillary porosity〖WTBX〗(R2=0.83,0.83,n=19,p<0.01)〖WTBZ〗.SOC also promote the soil aggregation.The content of SOC positively related to soil aggregation degree and aggregation 〖WTBX〗(R2=0.62,0.76,n=19,p<0.01)〖WTBZ〗.The content of N element was the highest in forest soil in the study area.The content of effective N was six times as large as content of effective P,and 2.5 times of effective K.In soil nutrient elements of N,P,K,the content of SOC had significant relationship with content of N,especially with effective N〖WTBX〗(R2=0.66,n=19,p<0.01)〖WTBZ〗,but not obvious with contents of P and K.The SOC played the dominant role in the N and P mineralization.From top layer to bottom layer,the C/N also descended.The C/P was about six times as great as C/N.Cation exchange capacity (CEC) was closely related to soil aggregation degree(〖WTBX〗R2=0.49,n=19,p<0.01〖WTBZ〗),which means the effect of SOC on CED was practiced by improving soil structure.

No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 张京祥,李建波,芮富宏. 竞争型区域管治:机制、特征与模式——以长江三角洲地区为例[J]. 长江流域资源与环境, 2005, 14(5): 670 -674 .
[2] 夏叡, 李云梅, 李尉尉. 无锡市城市扩张的空间特征及驱动力分析[J]. 长江流域资源与环境, 2009, 18(12): 1109 .
[3] 张方方 |齐述华 |廖富强 |张起明. 鄱阳湖湿地出露草洲分布特征的遥感研究[J]. 长江流域资源与环境, 2011, 20(11): 1361 .
[4] 夏 双|阮仁宗|周 义|王玉强. 基于FY2C卫星数据的藏北高原降水估算研究[J]. 长江流域资源与环境, 2013, 22(06): 786 .
[5] 沈非, 袁甲, 黄薇薇, 查良松. 基于地学信息图谱的合肥市城市扩展时空特征及驱动力分析[J]. 长江流域资源与环境, 2015, 24(02): 202 .
[6] 谢志祥, 任世鑫, 李阳, 刘静玉. 长江中游城市群城市效率水平测度及空间分异研究[J]. 长江流域资源与环境, 2015, 24(10): 1705 -1710 .
[7] 李敏, 张灿明, 李姣, 邓学建. 南洞庭湖湿地鱼类生境景观变化及其人为驱动[J]. 长江流域资源与环境, 2015, 24(12): 2069 -2075 .
[8] 刘耀林, 范建彬, 孔雪松, 张梦珂, 刘艳芳. 中国城市土地消耗强度的时空格局与收敛性分析[J]. 长江流域资源与环境, 2016, 25(01): 113 -119 .