نتایج جستجو برای: forestation

تعداد نتایج: 158  

Journal: :Botanical Gazette 1915

Journal: :Acta Agraria Debreceniensis 2015

2002
Joop J. VEGTER

This book is printed on acid-free paper responsibly manufactured from sustainable forestation, for which at least two trees are planted for each one used for paper production.

2017
Weiwei Liu Fei Lu Yunjian Luo Wenjing Bo Lingqiao Kong Lu Zhang Bojie Liu Zhiyun Ouyang Xiaoke Wang

Global carbon cycles are impacted by human activity primarily via fossil fuel combustion and forest carbon budget alterations. In this study, the temporal dynamics and spatial distribution of forest biomass carbon (FBC) stock and density in China were analyzed to assess the large-scale effects of humans on FBC. The results indicated that from 1977 to 2013, the FBC stock increased by 62.9%, from...

2008
Xiaohua Wei Ge Sun Shirong Liu Hong Jiang Guoyi Zhou Limin Dai

The relationship between forests and streamflows has long been an important research interest in China. The purpose of this paper is to summarize progress and lessons learned from the forest-streamflow studies over the past four decades in China. To better measure the research gaps between China and other parts of the world, a brief global review on the findings from paired watershed studies ov...

Journal: :Electr. J. Comb. 2003
Ojas Parekh

We present a new proof of a result of Lovász on the maximum number of edges in a k-forest. We also apply a construction used in our proof to generalize the notions of a k-hypertree and k-forest to a class which extends some properties of trees, to which both specialize when k=2.

1999
Robert A. Scholtz Mark A. Barnes

|Ultra-wide bandwidth (UWB) signal propagation experiment is performed in a rural terrain to characterize the outdoor UWB signal propagation channel. The bandwidth of the signal used in this experiment is in excess of one GHz. The test apparatus and measurement technique are described. From the measured pulse response the mean delay, delay spread, propagation loss and forestation loss are deter...

Journal: :Nature Geoscience 2021

Land-cover changes can affect the climate by altering water and energy balance of land surface. Numerous modelling studies have indicated that alterations at surface result in considerable precipitation. Yet land-cover-induced precipitation remain largely unconstrained observations. Here we use an observation-based continental-scale statistical model to show forestation rain-fed agricultural Eu...

Journal: :BMC Public Health 2007
Hualiang Lin Qiyong Liu Junqiao Guo Jibo Zhang Jinfeng Wang Huaxin Chen

BACKGROUND Hemorrhagic fever with renal syndrome (HFRS) is endemic in Liaoning Province, China, and this province was the most serious area affected by HFRS during 2004 to 2005. In this study, we conducted a spatial analysis of HFRS cases with the objective to determine the distribution of HFRS cases and to identify key areas for future public health planning and resource allocation in Liaoning...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید