نتایج جستجو برای: grassland

تعداد نتایج: 10371  

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2007
Le Kang Xingguo Han Zhibin Zhang Osbert Jianxin Sun

Grasslands are the dominant landscape in China, accounting for 40% of the national land area. Research concerning China's grassland ecosystems can be chronologically summarized into four periods: (i) pre-1950s, preliminary research and survey of grassland vegetation and plant species by Russians, Japanese and Western Europeans, (ii) 1950-1975, exploration and survey of vegetation, soils and top...

2016
Peng Zhang Shan Lin Hong Ao Lijuan Wang Xiaoyan Sun Zhisheng An

Lake Qinghai is the largest lake in China and situated in an important climate-sensitive zone on the northeastern margin of the Tibetan Plateau, making it an ideal place to study the environmental evolution of the northwest China as well as the interplay between the Asian monsoon and the westerlies in the late Quaternary. In this study, detailed rock magnetic measurements were carried out on th...

2017
Barbara Maria Smith Anita Diaz Linton Winder

Habitat restoration projects are often conducted when prior use or extraction of natural resources results in land degradation. The success of restoration programmes, however, is variable, and studies that provide evidence of long term outcomes are valuable for evaluation purposes. This study focused on the restoration of vegetation within a limestone quarry in Dorset, UK between 1997 and 2014....

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2008
M V Cianciaruso M A Batalha

In some Cerrado regions where the water table is superficial and soils are hydromorphic, we may find wet grasslands. We studied temporal changes in some community descriptors, such as species density, plant density, basal area, and cylindrical volume in a Cerrado wet grassland in four different seasons of the year. We also compared the species richness and composition of the wet grassland with ...

2016
Hongyun Yao Andreas Wilkes Guodong Zhu Hongdan Zhang Xiaojuan Liu Dan Ding Xiajie Zhai Shiming Tang Qing Chen Yujuan Zhang Ding Huang Chengjie Wang

Grassland degradation due to overgrazing is common in many areas of the world. This study analyzed the potential of the stable carbon isotope (δ(13)C) value as a structural microcosmic index to monitor processes of grassland degradation. The δ(13)C values of plant leaves, roots and soils in non-grazed (NG) and over-grazed (OG) grassland were measured from samples collected from the seven types ...

2015
Jussi Lampinen Kalle Ruokolainen Ari-Pekka Huhta Maura (Gee) Geraldine Chapman

Regularly managed electric power line corridors may provide habitats for both early-successional grassland plant species and disturbance-dependent alien plant species. These habitats are especially important in urban areas, where they can help conserve native grassland species and communities in urban greenspace. However, they can also provide further footholds for potentially invasive alien sp...

2016
Changzhen Li Luhong Zhao Pingsheng Sun Fazhu Zhao Di Kang Gaihe Yang Xinhui Han Yongzhong Feng Guangxin Ren

In the Loess Hilly Region of China, the widespread conversion of cropland to forestland and grassland has resulted in great increased in organic carbon (C), nitrogen (N) and phosphorus (P) stocks in the shallow soil layers. However, knowledge regarding changes in C, N, and P in deep soil is still limited. To elucidate the responses of deep soil C, N, and P stocks and stoichiometry in response t...

2016
Jennifer Amy Vogel Stephen J. Dinsmore Philip M. Dixon Brian J. Wilsey

Loss of habitat is one of the primary factors affecting population declines of grassland birds, and recovery efforts have focused on increasing the amount of grassland habitat in the landscape. Assessing the value of habitat restorations for grassland birds is an essential component of grassland bird conservation. We compared grassland bird habitat use, reproductive success, nestling growth rat...

Journal: :Remote Sensing 2018
Baoping Meng Jinlong Gao Tiangang Liang Xia Cui Jing Ge Jianpeng Yin Qisheng Feng Hongjie Xie

Grassland cover and its temporal changes are key parameters in the estimation and monitoring of ecosystems and their functions, especially via remote sensing. However, the most suitable model for estimating grassland cover and the differences between models has rarely been studied in alpine meadow grasslands. In this study, field measurements of grassland cover in Gannan Prefecture, from 2014 t...

Journal: :ISPRS Int. J. Geo-Information 2015
Alessandra Capolupo Lammert Kooistra Clara Berendonk Lorenzo Boccia Juha Suomalainen

Grassland ecosystems cover around 40% of the entire Earth’s surface. Therefore, it is necessary to guarantee good grassland management at field scale in order to improve its conservation and to achieve optimal growth. This study identified the most appropriate statistical strategy, between partial least squares regression (PLSR) and narrow vegetation indices, for estimating the structural and b...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید