نتایج جستجو برای: soil type area

تعداد نتایج: 2014670  

        In this study we evaluate the effects of different types on soil Physical and chemical Properties and plant species biodiversity in the hyrcanian forests of Iran. For this porpuse 33 sample plots were established in 5 vegetation types consist of pure beech (Fagus orientalis), Ash plantation (fraxinus excelsior), spruce plantation (Picea abies), mixed forest and degraded forest. In each ...

2015
Wen Nie Wei Xian Feng-Lin Xu Lin Chen Takayoshi Kobayashi

Rainfall-induced soil erosion of a mountain area plays a significant role in supplying sediment and shaping the landscape. The related area of soil erosion, as an index of the changed landscape, is easier to calculate visually using some popular imaging tools. By image analysis, our work shows that the changing of the soil erosion area admits the structure of an S-growth curve. Therefore, we pr...

2003
DENNIS A. ALBERT BURTON V. BARNES

Albert, D.A. and Barnes, B.V., 1987. Effects of clearcutting on the vegetation and soil of a sugar maple-dominated ecosystem, western Upper Michigan. For. Ecol. Manage., 18: 283-298. The effects 50 years after clearcutting on the vegetation and soil of an ecosystem type dominated by sugar maple (Acer saccharum) were studied at four locations along the boundaries of the Sylvania Recreation Area ...

Journal: :مرتع و آبخیزداری 0
بهرام قلی نزاد استادیار گروه مرتع و آبخیزداری دانشکده منابع طبیعی، دانشگاه کردستان محمد جعفری استاد دانشکده منابع طبیعی دانشگاه تهران محمد علی زارع چاهوکی دانشیار دانشکده منابع طبیعی دانشگاه تهران حسین آذرنیوند استاد دانشکده منابع طبیعی دانشگاه تهران حسن پوربابایی دانشیار دانشکده منابع طبیعی دانشگاه گیلان

this research has been done with the aim of explaining environmental and managerial factors that affects on rangeland vegetation distribution in saral rangelands of kurdistan province. after selecting plant types as working area were done sampling from plant types and determined some of plants parameters such as kind and number of plants and cover percentage. various environmental factors such ...

2015
Hao Zheng Jixi Gao Yanguo Teng Chaoyang Feng Meirong Tian

Drought and shortages of soil water are becoming extremely severe due to global climate change. A better understanding of the relationship between vegetation type and soil-moisture conditions is crucial for conserving soil water in forests and for maintaining a favorable hydrological balance in semiarid areas, such as the Saihanwula National Nature Reserve in Inner Mongolia, China. We investiga...

Journal: :Remote Sensing 2017
Lanfa Liu Min Ji Manfred F. Buchroithner

Soil spectroscopy has experienced a tremendous increase in soil property characterisation, and can be used not only in the laboratory but also from the space (imaging spectroscopy). Partial least squares (PLS) regression is one of the most common approaches for the calibration of soil properties using soil spectra. Besides functioning as a calibration method, PLS can also be used as a dimension...

Journal: :Global change biology 2017
Virginia L Jin Marty R Schmer Catherine E Stewart Aaron J Sindelar Gary E Varvel Brian J Wienhold

Over the last 50 years, the most increase in cultivated land area globally has been due to a doubling of irrigated land. Long-term agronomic management impacts on soil organic carbon (SOC) stocks, soil greenhouse gas (GHG) emissions, and global warming potential (GWP) in irrigated systems, however, remain relatively unknown. Here, residue and tillage management effects were quantified by measur...

2015
Y. Yu W. Wei L. D. Chen F. Y. Jia L. Yang H. D. Zhang T. J. Feng

Soil moisture plays a key role in vegetation restoration and ecosystem stability in arid and semiarid regions. The response of soil moisture to rainfall pulses is an important hydrological process, which is strongly influenced by land use during the implementation of vegetation restoration. In this study, vertical soil moisture variations of woodland (Pinus tabulaeformis), native grassland (Sti...

ژورنال: علوم آب و خاک 2015
آزادنیا, فرزاد, خسروی, حسن, ممبنی, مریم, کرمشاهی, عبدالعلی, گرایی, پرویز,

Desertification is currently a big problem in many countries, especially in developing countries, and includes natural processes and improper human activities. The present study was conducted to evaluate the potential of desertification with an emphasis on water, climate and soil criteria using IMDPA Model in Abbas plain, Ilam province with an area about 18028.8 hectare. Geometric averages for ...

Journal: :Tree physiology 2011
Yumei Zhou Jianwu Tang Jerry M Melillo Sarah Butler Jacqueline E Mohan

Examining the responses of root standing crop (biomass and necromass) and chemistry to soil warming is crucial for understanding root dynamics and functioning in the face of global climate change. We assessed the standing crop, total nitrogen (N) and carbon (C) compounds in tree roots and soil net N mineralization over the growing season after 6 years of experimental soil warming in a temperate...

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