Soil Organic Carbon and Labile Carbon Along a Precipitation Gradient and Their Responses to Some Environmental ChangesEnglish Full Text

WANG Shu-Ping1,2, ZHOU Guang-Sheng1, GAO Su-Hua3 and GUO Jian-Ping3 1 Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093(China). 2.bta.net.cn2 College of Resources and Environment, Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China)3 Chinese Academy of Meteorological Science, Beijing 100081 (China)

Abstract: Based on data from a field survey in 2001 along the Northeast China transect （NECT）, a precipitation gradient,and a short-term simulation experiment under ambient CO2 of 350 μmol mol-1 and doubled CO2 of 700 μmol mol-1with different soil moisture contents of 30%-45%, 45%-60%, and 60%-80% soil water holding capacity, the distributionof soil organic carbon and labile carbon along the NECT, their relationships with precipitation and their responses toCO2 enrichment and soil moisture changes were analyzed. The results indicated that the soil labile carbon along thegradient was significantly related to soil organic carbon （r = 0.993, P ＜ 0.001）. The soil labile carbon decreased morerapidly with depth than organic carbon. The soil organic and labile carbon along the gradient decreased with decrease inlongitude in both the topsoils and subsoils, and the coefficient of variation for the labile carbon was greater than that forthe organic carbon. Both the soil organic carbon and labile carbon had significant linear relationships with precipitation,with the correlation coefficient of soil organic carbon being lower （0.677 at P ＜ 0.001） than that of soil labile carbon（0.712 at P ＜ 0.001）. In the simulation experiment with doubled and ambient CO2 and different moisture contents, thecoefficient of variation for soil organic carbon was only 1.3%, while for soil labile carbon it was 29.7%. With doubled CO2concentration （700 μmol mol-1）, soil labile carbon decreased significantly at 45% to 60% of soil moisture content. Theseindicated that soil labile carbon was relatively more sensitive to environmental changes than soil organic carbon.

Keywords：

environmental changes; labile carbon; organic carbon; precipitation gradient; soil;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153.6;

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
CAJ Download
PDF Download

Soil Organic Carbon and Labile Carbon Along a Precipitation Gradient and Their Responses to Some Environmental ChangesEnglish Full Text

Read on your phone instantly

Citation Network

Related Literature