Climate Change and Dryland Agricultural Ecosystem Management
Climate Change and Dryland Agricultural Ecosystem Management
Climate Change and Dryland Agricultural Ecosystem Management
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Mountains during 2001-2008, <strong>and</strong> analyzed the soil physico-chemical properties in different stages of<br />
ecological restoration. The results showed that: Vegetation community environment gradually<br />
optimized when the human interference was eliminated, for example, the family, genus <strong>and</strong> species of<br />
plant communities have significantly increased, species frequently replaced. Community vertical<br />
height gradually increased <strong>and</strong> community structure showed supraterraneous stratifiication when trees<br />
<strong>and</strong> shrubs appeared in community. Annual <strong>and</strong> biennial weed(A) <strong>and</strong> Perennial forbs(PF) accounted<br />
for a large proportion in the early stage of the restoration process, then the woody plants gradually<br />
increased in middle-later period. With the restoration time going, the total community diversity<br />
increased, the changes of vegetation community species richness <strong>and</strong> Shannon-wiener index in spatial<br />
structure as follows: Herb layer(HL)>shrub layer(SL)>tree layer(TL), but the tend of Simpson index<br />
was opposite. Soil water content(SWC) increased from 16.1% in early stage to 38.91% in later stage<br />
of the restoration process, Soil organic carbon (SOC) <strong>and</strong> total nitrogen(TN) contents gradually<br />
increased. After grazing prohibition measures, degraded forest l<strong>and</strong> achieved a quick restoration<br />
process: Grass community-Shrub community-Trees community. The community species composition,<br />
structure characteristic <strong>and</strong> diversity were similar to the local mature secondary vegetation, <strong>and</strong><br />
showed a better adaptability <strong>and</strong> recovery effects when recover to the original pioneer community of<br />
mixed forest of shrub-trees.<br />
Keywords: Northern slope of Qilian; Degraded woodl<strong>and</strong>; Vegetation restoration; Community<br />
Succession; Eco-hydrology effects<br />
Analysis of storage, water holding characteristics <strong>and</strong> nutrient<br />
element storages of litter with different Coniferous types in<br />
Xiaolong Mountain forest, Gansu Province<br />
Chang Yajun, Wang Wei, Cheng Qi, Cao Jing∗, Lu Haiyan<br />
Key Laboratory of Arid <strong>and</strong> Grassl<strong>and</strong> Ecology,School of Life Science,Lanzhou University,Lanzhou 730000<br />
Abstract: In agricultural production, using water status of crops as irrigation basis is much more<br />
reliable than soil water status. Transpiration, which is affected by the characteristics of plant itself <strong>and</strong><br />
environmental factors, is the main pathway of plant water loss. So, researches on crop transpiration<br />
water consumption can provide a theoretical basis for agricultural production, particularly for irrigation<br />
agriculture development in arid <strong>and</strong> semi-arid areas. And also, it is an important basis for the<br />
optimizing configuration of windbreak systems. Hexi Corridor oasis is an important agricultural base<br />
in China, <strong>and</strong> it is also a typical example for oasis ecological economy development of arid region.<br />
Farml<strong>and</strong> windbreak, mainly consisted by poplar trees (Populus sp.), is emerging the important role in<br />
protecting the 21.29 million ha of farml<strong>and</strong>, 63.3% of all the irrigated area in Hexi, to some extent<br />
weakened the impact of severe weather. Transpiration characteristics <strong>and</strong> water use efficiency of crops<br />
within windbreak is an important measure to determine crop water productivity <strong>and</strong> ecological<br />
∗ Corresponding author: CAO Jing , caoj46@yahoo.com.cn<br />
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