Arid
DOI10.2307/2404952
Estimating the effects of land degradation and rainfall variation on productivity in rangelands: An approach using remote sensing and models of grazing and herbage dynamics
Pickup, G
来源期刊JOURNAL OF APPLIED ECOLOGY
ISSN0021-8901
出版年1996
卷号33期号:4页码:819-832
英文摘要

1. Land degradation in non-equilibrium rangelands may be defined in terms of loss of resilience and is linked with lower economic productivity through reduction in forage consumption by stock.


2. Loss of resilience may be represented by lower water use efficiency and increased tree and shrub cover, in a simple herbage production and consumption model. The model may be calibrated from remotely sensed data.


3. Model calibration for rangeland areas in central Australia yields parameter values for degraded and undegraded situations, allowing estimation of productivity.


4. Modelling of a 50-year rainfall sequence shows that herbage production and consumption by cattle change through time because of rainfall variability. They also change with paddock layout and access to water.


5. The effect of degradation on herbage consumption is relatively small compared with the effects of rainfall variability, but it increases the chance of running out of forage during drought.


英文关键词grazing herbage production modelling non-equilibrium rangelands semi-arid zone
类型Article
语种英语
国家AUSTRALIA
收录类别SCI-E
WOS记录号WOS:A1996VQ85000016
WOS关键词CENTRAL AUSTRALIA ; SENSED DATA ; VEGETATION ; CATTLE ; UNDERSTOREY ; MANAGEMENT ; STABILITY ; PATTERNS ; IMPACT ; COVER
WOS类目Biodiversity Conservation ; Ecology
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构Commonwealth Scientific and Industrial Research Organisation
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/132929
作者单位(1)CSIRO,DIV WILDLIFE & ECOL,ALICE SPRINGS,NT 0871,AUSTRALIA
推荐引用方式
GB/T 7714
Pickup, G. Estimating the effects of land degradation and rainfall variation on productivity in rangelands: An approach using remote sensing and models of grazing and herbage dynamics[J]. Commonwealth Scientific and Industrial Research Organisation,1996,33(4):819-832.
APA Pickup, G.(1996).Estimating the effects of land degradation and rainfall variation on productivity in rangelands: An approach using remote sensing and models of grazing and herbage dynamics.JOURNAL OF APPLIED ECOLOGY,33(4),819-832.
MLA Pickup, G."Estimating the effects of land degradation and rainfall variation on productivity in rangelands: An approach using remote sensing and models of grazing and herbage dynamics".JOURNAL OF APPLIED ECOLOGY 33.4(1996):819-832.
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