Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/bg-13-4721-2016 |
Degradation of net primary production in a semiarid rangeland | |
Jackson, Hasan; Prince, Stephen D. | |
通讯作者 | Jackson, Hasan |
来源期刊 | BIOGEOSCIENCES |
ISSN | 1726-4170 |
EISSN | 1726-4189 |
出版年 | 2016 |
卷号 | 13期号:16页码:4721-4734 |
英文摘要 | Anthropogenic land degradation affects many biogeophysical processes, including reductions of net primary production (NPP). Degradation occurs at scales from small fields to continental and global. While measurement and monitoring of NPP in small areas is routine in some studies, for scales larger than 1 km(2), and certainly global, there is no regular monitoring and certainly no attempt to measure degradation. Quantitative and repeatable techniques to assess the extent of deleterious effects and monitor changes are needed to evaluate its effects on, for example, economic yields of primary products such as crops, lumber, and forage, and as a measure of land surface properties which are currently missing from dynamic global vegetation models, assessments of carbon sequestration, and land surface models of heat, water, and carbon exchanges. This study employed the local NPP scaling (LNS) approach to identify patterns of anthropogenic degradation of NPP in the Burdekin Dry Tropics (BDT) region of Queensland, Australia, from 2000 to 2013. The method starts with land classification based on the environmental factors presumed to control (NPP) to group pixels having similar potential NPP. Then, satellite remotely sensing data were used to compare actual NPP with its potential. The difference in units of mass of carbon and percentage loss were the measure of degradation. The entire BDT (7.45 x 10(6) km(2)) was investigated at a spatial resolution of 250 x 250 m. The average annual reduction in NPP due to anthropogenic land degradation in the entire BDT was -2.14 Mg C m(-2) yr(-1), or 17% of the non-degraded potential, and the total reduction was -214 Mg C yr(-1). Extreme average annual losses of 524.8 gC m(-2) yr(-1) were detected. Approximately 20% of the BDT was classified as "degraded". Varying severities and rates of degradation were found among the river basins, of which the Belyando and Suttor were highest. Interannual, negative trends in reductions of NPP occurred in 7% of the entire region, indicating ongoing degradation. There was evidence of areas that were in a permanently degraded condition. The findings provide strong evidence and quantitative data for reductions in NPP related to anthropogenic land degradation in the BDT. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000383799000001 |
WOS关键词 | LAND DEGRADATION ; SOIL-EROSION ; FLUXNET MEASUREMENTS ; NORTHERN AUSTRALIA ; GLOBAL ASSESSMENT ; CLIMATE-CHANGE ; WEST-AFRICA ; VEGETATION ; DESERTIFICATION ; RAINFALL |
WOS类目 | Ecology ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/191754 |
作者单位 | Univ Maryland, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Jackson, Hasan,Prince, Stephen D.. Degradation of net primary production in a semiarid rangeland[J],2016,13(16):4721-4734. |
APA | Jackson, Hasan,&Prince, Stephen D..(2016).Degradation of net primary production in a semiarid rangeland.BIOGEOSCIENCES,13(16),4721-4734. |
MLA | Jackson, Hasan,et al."Degradation of net primary production in a semiarid rangeland".BIOGEOSCIENCES 13.16(2016):4721-4734. |
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