Large-scale soil organic carbon mapping based on multivariate modelling: The case of grasslands on the Loess Plateau

2017 ◽  
Vol 29 (1) ◽  
pp. 26-37 ◽  
Author(s):  
Yinyin Wang ◽  
Lei Deng ◽  
Gaolin Wu ◽  
Kaibo Wang ◽  
Zhouping Shangguan
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Loess Plateau ◽  
Large Scale ◽  
The Loess Plateau ◽  
Multivariate Modelling ◽  
Carbon Mapping

scholarly journals Soil organic carbon dynamics following afforestation in the Loess Plateau of China

2013 ◽  
Vol 10 (7) ◽  
pp. 11181-11211 ◽  
Author(s):  
N. Lu ◽  
J. Liski ◽  
R. Y. Chang ◽  
A. Akujärvi ◽  
X. Wu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Loess Plateau ◽  
Carbon Fixation ◽  
Temporal Dynamics ◽  
Climatic Factors ◽  
Early Stage ◽  
Arable Land ◽  
The Loess Plateau ◽  
Successional Stage

Abstract. Soil organic carbon (SOC) is the largest terrestrial carbon pool and sensitive to land use and cover change; its dynamics is critical for carbon cycling in terrestrial ecosystems and the atmosphere. In this study, we combined a modeling approach and field measurements to examine the temporal dynamics of SOC following afforestation of former arable land at six sites under different climatic conditions in the Loess Plateau during 1980–2010. The results showed that the measured mean SOC increased to levels higher than before afforestation when taking the last measurements (i.e., at age 25 to 30 yr), although it decreased in the first few years at the wetter sites. The accumulation rates of SOC were 1.58 to 6.22% yr–1 in the upper 20 cm and 1.62 to 5.15% yr–1 in the upper 40 cm of soil. The simulations reproduced the basic characteristics of measured SOC dynamics, suggesting that litter input and climatic factors (temperature and precipitation) were the major causes for SOC dynamics and the differences among the sites. They explained 88–96, 48–86 and 57–74% of the variations in annual SOC changes at the soil depths of 0–20, 0–40, and 0–100 cm, respectively. Notably, the simulated SOC decreased during the first few years at all the sites, although the magnitudes of decreases were small at the drier sites. This suggested that the modeling may be advantageous in capturing SOC changes at finer time scale. The discrepancy between the simulation and measurement was a result of uncertainties in model structure, data input, and sampling design. Our findings indicated that afforestation promoted soil carbon sequestration at the study sites, which is favorable for further restoration of the vegetation and environment. Afforestation activities should decrease soil disturbances to reduce carbon release in the early stage. The long-term strategy for carbon fixation capability of the plantations should also consider the climate and site conditions, species adaptability, and successional stage of recovery.

Soil organic carbon density and stock at the catchment scale of a hilly region of the loess plateau

2015 ◽  
Vol 35 (9) ◽  
Author(s):  
薛志婧 XUE Zhijing ◽  
马露莎 MA Lusha ◽  
安韶山 AN Shaoshan ◽  
王万忠 WANG Wanzhong
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Loess Plateau ◽  
Carbon Density ◽  
The Loess Plateau ◽  
Catchment Scale ◽  
Hilly Region ◽  
Soil Organic Carbon Density
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