نتایج جستجو برای: exclosure
تعداد نتایج: 275 فیلتر نتایج به سال:
The exclusion of herbivores in forest areas is a strategy used to reduce the impact selective browsing and increase regeneration desired plant species. On Anticosti Island (Québec, Canada), by white-tailed deer prevents balsam fir – white birch forests leading their conversion into spruce forests. Large exclosures were established for ca 10–12 years clear-cuts with patches residual from 2001 20...
Gullies are sources and reservoirs of sediments perform as efficient transfers runoff sediments. In recent years, several techniques technologies emerged to facilitate monitoring gully dynamics at unprecedented spatial temporal resolutions. Here we present a detailed study valley-bottom in Mediterranean rangeland with savannah-like vegetation cover that was partially restored 2017. Restoration ...
Ungulate browsing has been studied for several decades in the northern hemisphere. However, studies have mainly focused on just one or two ungulate species, while rarely contrasting relative effects of summer and winter browsing. This limits our understanding dynamics landscapes where species diversity is increasing. We conducted a seasonal exclosure experiment former clear-cuts multi-species s...
Abstract Herbivores form an important link in the transfer of energy within a food web and are strongly influenced by bottom‐up trophic cascades. Current hypotheses suggest that herbivore consumption impact on plants should scale positively with plant resource availability. However, depending effect resources quantity quality, may vary different types resources. We test four alternative for rel...
Rangeland degradation has been identified as a serious concern in alpine regions of western China on the Qinghai-Tibetan plateau (QTP). Numerous government-sponsored programs have been initiated, including many that feature long-term grazing prohibitions and some that call for eliminating pastoralism altogether. As well, government programs have long favored eliminating plateau pikas (Ochotona ...
Nonconsumptive effects of a generalist ungulate herbivore drive decline of unpalatable forest herbs.
High herbivore pressure is expected to benefit unpalatable species that co-occur with palatable browsed species. However, for five unpalatable understory species we found no evidence of benefit from deer browse. Detailed studies of one species in natural populations, Arisaema triphyllum, revealed surprising changes in its population structure and demography: deer browse level on a palatable spe...
In agroecosystems, local and landscape features, as well as natural enemy abundance and richness, are significant predictors of predation services that may result in biological control of pests. Despite the increasing importance of urban gardening for provisioning of food to urban populations, most urban gardeners suffer from high pest problems, and have little knowledge about how to manage the...
Our research on the herbaceous understory vegetation in the Kluane region, Yukon, has focused on the structure and function of natural forest understory and grassland communities. The research has involved two long-term projects. The first investigated fertilizer addition and mammalian herbivore exclosure in understory vegetation over a 20-year period and showed that nutrient availability, and ...
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