Climate Change and Dryland Agricultural Ecosystem Management

filling stage took second place and seeding stage was the least one at daily mean value (8:00-18:00)
or each time segment. For example, the daily water consumption of maize at flowering stage was
2.648 kg plant -1 in W-S, it 2 times than filling stage (1.168 kg plant -1 ) and 2.599 kg plant -1 more than
seedling stage (0.049 kg plant -1 ). Based on the above results, the variation of transpiration water
consumption of maize within a windbreak was bellow: 1) more in the middle growth period and less
in both earlier and later stage. 2) more in eastern region and less in western region. 3) more at
non-shading region and less at shading ones.
Water ecological problem is an important part of agroforestry system research. From the upper results,
we concluded that variation of maize leaf area was the principal reason of transpiration water
consumption spatial variation. The spatial variation of leaf area led to the emergence of maize
transpiration water consumption in the windbreak in a "more in eastern regions and less in western
regions, more in non-shading regions and less in shading regions" variation.
Keywords: coniferous forest; litter; water holding characteristics; nutrient element storage; Xiaolong
Mountain
Analysis of the sandland-agroecosystem coupling evolution in Mu
Us.
Hu Bing-Hui1,2, Liao Yun-Cheng2,∗
1 Department of Environment Science and Engineering, Southwest Forestry University, Kunming, Yunnan, 650224,
China
2 College of Agriculture, Northwest A&F University, Yangling, Shanxi, 712100, China
Abstract: Aiming at real productivity of frail agroecosystem in Mu Us sandland, basing on coupling
theory of complex ecosystem, using energy theory method, and selecting Wushen banner, where
grazing is dominant, and Yuyang district, where farming is the case, as the relative research object, the
primary productivity, secondary productivity and system coupling status of farming and grazing
system in Yuyang district and Wushen banner have been compared and analyzed in near 27 years.
As the result, the evolvement rule of coupling degree of farming and grazing system in representative
regions, and the building ideas of productivity development of farming and grazing system in
farming-dominant zones and grazing-dominant zones of Mu Us sandland, were brought forward, it
looks forward to offer credible theory support and policy direction to similar weak agroecosystem
healthy development.
Keywords: agroecosystem coupling; evolvement rule; emergy theory; Mu Us sandland
∗ Corresponding author: Liao Yun-Cheng, male, professor, supervisor of PhD.
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