نتایج جستجو برای: trees and shrubs canopy

تعداد نتایج: 16840862  

2013
J. E. Weaver

So profoundly has this river modified the effects of the general grassland climate that in many places prairie has given way to woodland and forest. Several distinct forest communities along the river in southeastern Nebraska and adjacent parts of Kansas, Missouri, and Iowa extend for short distances over the uplands, but farther along the major streams. Most of the trees and shrubs of this for...

2017
Cuicui Ji Yonghong Jia Zhihai Gao Huaidong Wei Xiaosong Li

Desert vegetation plays significant roles in securing the ecological integrity of oasis ecosystems in western China. Timely monitoring of photosynthetic/non-photosynthetic desert vegetation cover is necessary to guide management practices on land desertification and research into the mechanisms driving vegetation recession. In this study, nonlinear spectral mixture effects for photosynthetic/no...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2009
Nalini M Nadkarni Willam A Haber

Tropical pastures present multiple barriers to tree regeneration and restoration. Relict trees serve as "regeneration foci" because they ameliorate the soil microclimate and serve as safe spots for dispersers. Here, we describe another mechanism by which remnant trees may facilitate pasture regeneration: the presence of seed banks in the canopy soil that accumulates from decomposing epiphytes w...

Journal: :Canadian Journal of Forest Research 2021

Forested wetlands are an integral but understudied part of heterogeneous landscapes in Atlantic Canada, although they known to provide habitat for species at risk. Our objectives were explore patterns forest structure across edges between forested wetland and upland forest, locate changes vegetation assess multivariate relationships structure. study sites temperate (Acadian) landscapes. We samp...

ژورنال: علوم آب و خاک 2001
بنی هاشمی, ضیاءالدین, حمزه زرقانی, حبیب ‌الله,

A field survey was carried out in Firoozabad Beneh (Pistacia mutica) Forest Station covering about 12000 hectares. Data were collected using combined random and systematic sampling methods to study the effect of altitude, dominant slope direction, sex and age of the host and plant canopy on rust severity caused by Pileolaria terebinthi. The rust severity decreased with plant age and elevation...

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