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为了解和掌握浅翻耕措施对荒漠化草原改良土壤水分及原生植被组成的影响,对此项改良措施的利与弊做一客观的评价,试验对浅翻耕后土壤含水率、牧草组成、“四度一量”、地下生物量等方面进行测定。结果表明:浅翻耕后地表至地下70 cm贮水量由原生植被的30.42 mm提高到61.52 mm,提高了102.33%;浅翻耕后群落中的3种优良牧草甘草、达乌里胡枝子和沙芦草的密度分别下降了55.69%、93.78%、100%;同时根茎型牧草——中亚白草重要值提高了27.1个百分点,而甘草的重要值下降了1.21个百分点;浅翻耕后12种牧草受到了抑制,重要值下降,11种牧草从群落中消失。说明采用浅翻耕改良措施能使荒漠化草原土壤含水率大幅度提高,为补播牧草新品种创造了良好的土壤水条件,这也是荒漠化草原补播成功与否的关键;浅翻耕改良措施应针对中、重度退化草原,不宜针对优良牧草占总品种40.74%的轻度退化草场。
In order to understand and grasp the impact of shallow tillage on desertification steppe improved soil moisture and native vegetation composition, to make an objective evaluation of the pros and cons of this improvement measures, the experiment on the shallow tillage soil moisture content, pasture composition, “A degree of four”, underground biomass and other aspects of determination. The results showed that the water storage capacity at 70 cm from the surface to the ground after shallow tillage increased from 30.42 mm to 61.52 mm in original vegetation, increased by 102.33%. Three excellent pasture licorice, dahurian branch and aloe The density of grass decreased by 55.69%, 93.78% and 100% respectively. Meanwhile, the important value of rhizome grass-white grass increased by 27.1 percentage points, while that of licorice decreased by 1.21 percentage points. Forage was suppressed, the importance value decreased, and 11 species of forage disappeared from the community. It shows that using shallow tillage improvement measures can greatly increase the soil moisture content of desert steppe and create good soil water conditions for rewetting new species of forage grass. This is also the key to success of desertification steppe replanting. For moderately and severely degraded grasslands, weeds are not suitable for moderately degraded pasture with 40.74% of the total.