本文關鍵詞：烏魯木齊市周邊草地禁牧效益分析　出處：《新疆農業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 草地 禁牧 群落結構 經濟效益

【摘要】：新疆主要以傳統(tǒng)的游牧為主,過度放牧是新疆草原退化的主要原因。禁牧作為生態(tài)恢復的重要手段,已成為新疆草地恢復和保護的一項重要措施。研究植被群落結構與草地經濟效益對禁牧的響應,對理解草地退化與恢復機理以及合理利用封育后的草地等提供指導作用。本研究以烏魯木齊市周邊禁牧3年、4年和5年的平原荒漠、山地荒漠、平原荒漠草原、山地荒漠草原、山地草原和低地草甸草地類型為對象,分別測定圍欄內草地植被群落結構、高度、覆蓋度、生物量,并計算其合理載畜量和圍欄后的經濟效益,以期為政府決策提供科學依據(jù)。主要結果如下:1、經過3年、4年、5年的禁牧后,不同類型草地植物群落的組成結構未發(fā)生明顯的變化;圍欄主要植物種的高度存在一定差異,均表現(xiàn)為禁牧5年禁牧4年禁牧3年;除低地草甸外,其余各類型草地植被覆蓋度均為禁牧4年禁牧5年禁牧3年。2、受到氣候波動和所處位置的影響,不同草地類型間生物量總體上表現(xiàn)為禁牧4年禁牧5年禁牧3年。草地禁牧雖可以有效地禁止牲畜對植物的采食踐踏干擾,但其對植被生物量的影響遠不及年度氣候條件波動的影響。3、山地荒漠和山地荒漠草原合理載畜量在禁牧4年出現(xiàn)最大值,而平原荒漠在禁牧5年出現(xiàn)最小值;隨禁牧時間的延長,山地草原和低地草甸合理載畜量逐漸減小,平原荒漠草原變化趨勢則與之相反,在禁牧5年合理載畜量達到頂峰。4、山地荒漠和低地草甸禁牧經濟效益最高,且在禁牧4年經濟效益達最大;山地草原經濟效益隨著禁牧時間延長而逐漸降低,平原荒漠草原則與之呈相反的變化趨勢;平原荒漠經濟效益在禁牧4年有最小值,僅為431.75元。5、綜合禁牧后不同草地類型中植物群落和草地經濟效益,禁牧需要與利用(放牧和刈割)合理配置,才能使牧草在蓋度、高度、生物量等方面比單純放牧有所提高,但提高的程度并不與圍欄禁牧時間成正比。
[Abstract]:Xinjiang is dominated by traditional nomadic, overgrazing is the main reason of grassland degradation in Xinjiang. Grazing ban as an important means of ecological restoration. It has become an important measure for grassland restoration and protection in Xinjiang. The response of vegetation community structure and grassland economic benefit to forbidding grazing has been studied. This study provides guidance to understand the mechanism of grassland degradation and restoration and to make rational use of fenced grassland. In this study, the desert of plain, mountain and desert in Urumqi for 3 years, 4 years and 5 years were banned. The vegetation community structure, height, coverage and biomass of grassland community were measured in plain desert steppe, mountain desert steppe, mountain steppe and lowland meadow grassland. In order to provide scientific basis for government decision-making, the main results are as follows: 1, after 3 years, 4 years, 5 years of grazing ban. There was no significant change in the composition of plant communities in different types of grassland. The height of the main plant species in the fence was different to some extent, all of them were five years and four years and three years. With the exception of lowland meadow, the vegetation coverage of all types of grassland was 4 years, 5 years and 3 years, which was affected by climate fluctuation and location. The biomass of different grassland types was 4 years, 5 years and 3 years. Although forbidding grazing could effectively prevent livestock from interfering with plant feeding and trampling. But its influence on vegetation biomass was much less than that of annual climatic fluctuation. The reasonable carrying capacity of mountain desert and mountain desert steppe appeared maximum in 4 years of no grazing. However, the desert of the plain had the lowest value in the five years of forbidding grazing. With the extension of the grazing ban time, the reasonable stocking capacity of mountain steppe and lowland meadow gradually decreased, and the change trend of plain desert steppe was opposite, and the reasonable stocking capacity reached the peak in 5 years. The economic benefit of forbidding grazing in mountain desert and lowland meadow was the highest, and the economic benefit of forbidding grazing was the highest in 4 years. The economic benefits of mountain steppe gradually decreased with the extension of grazing ban time, while the desert steppe in plain showed the opposite trend. The economic benefit of desert in plain had the minimum value in 4 years, which was only 431.75 yuan. The economic benefits of plant community and grassland in different grassland types after comprehensive grazing ban were analyzed. In order to improve forage coverage, height and biomass, the forage forage needs reasonable allocation and utilization (grazing and mowing), but the increase is not proportional to the time of fencing grazing.
【學位授予單位】：新疆農業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：F323.212;S812

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