نتایج جستجو برای: dryland cold area

تعداد نتایج: 685576  

2004
Richard George Ken Lawrie Peter Woodgate

When you boil it all down, the management of dryland salinity requires technically feasible and effective management practices to be adopted by land managers. In most areas these will be farmers who must incorporate these practices while maintaining viable farming enterprises in tough and competitive environments. These land managers, or community-based catchment authorities, seek sufficient kn...

2012
L. Wang P. D’Odorico J. P. Evans D. J. Eldridge M. F. McCabe K. K. Caylor E. G. King

Drylands cover about 40 % of the terrestrial land surface and account for approximately 40 % of global net primary productivity. Water is fundamental to the biophysical processes that sustain ecosystem function and food production, particularly in drylands where a tight coupling exists between ecosystem productivity, surface energy balance, biogeochemical cycles, and water resource availability...

2014
Sally E Thompson Shmuel Assouline Li Chen Ana Trakhtenbrot Tal Svoray Gabriel Katul

Seed dispersal alters gene flow, reproduction, migration and ultimately spatial organization of dryland ecosystems. Because many seeds in drylands lack adaptations for long-distance dispersal, seed transport by secondary processes such as tumbling in the wind or mobilization in overland flow plays a dominant role in determining where seeds ultimately germinate. Here, recent developments in mode...

2014
Shuqin Gao Xu Pan Qingguo Cui Yukun Hu Xuehua Ye Ming Dong

Plant interactions greatly affect plant community structure. Dryland ecosystems are characterized by low amounts of unpredictable precipitation as well as by often having biological soil crusts (BSCs) on the soil surface. In dryland plant communities, plants interact mostly as they compete for water resources, and the direction and intensity of plant interaction varies as a function of the temp...

2017
Xiaosong Li Zengyuan Li Cuicui Ji Hongyan Wang Bin Sun Bo Wu Zhihai Gao

Fractional covers of photosynthetic and non-photosynthetic vegetation are key indicators for land degradation surveillance in the dryland of China. However, there are no available, well validated, and multispectral-based products. Aiming for this, we selected the Beijing and Tianjin Sandstorm Source Region as the study area, and utilized the linear spectral mixture model for generating the frac...

Journal: :Proceedings of the New Zealand Grassland Association 1983

Journal: :Current Opinion in Environmental Sustainability 2021

Journal: :journal of agricultural science and technology 2011
a. khashei-siuki m. kouchkzadeh b. ghahraman

khorasan province is one of the most important provinces of iran, especially as regards agricultural products. the prediction of crop yield with available data has important effects on socio-economic and political decisions at the regional scale. this study shows the ability of artificial neural network (ann) technology and adaptive neuro-fuzzy inference systems (anfis) for the prediction o...

2008
Melissa Schlegel

rise of groundwater levels in unconfined aquifers can cause dryland salinity to increase by several processes including; dissolution of windblown halite, and incorporation of saline clay pore water. The primary process of increased groundwater salinity is evaporation of shallow groundwater as it rises to within a few meters of the ground surface. in murray Basin, australia, the effect of drylan...

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