畜禽草耦合模式初探
[Abstract]:Steppe herding chickens promote the coupling of livestock, poultry and grass, and become a new type of grassland utilization mode, which plays a good role in biological locust control, soil fertilization and herdsmen's income increase, etc. It is possible to promote the ecological and productive functions of degraded grassland on a large scale. Agricultural area scattered chicken has a long history, the method is simple, easy to master, can be copied to the grassland pastoral area? How does this approach affect grassland ecosystems? It is not clear yet. Therefore, through the comparative experiment of (MJ) and (CK), the feasibility of farmed chicken in agricultural area was explored. The results showed that the spatial distribution of chickens in MJ plot was in accordance with the power-law model of density dependent aggregation distribution. The density of the chickens decreased significantly from 4000 / hmt2 (R20m) to 500 / hmt2 (20 mR60 / m) and 100 / hmt2 (R60 m).) over the distance from close to far away. Plant communities were significantly affected by MJ, distance and MJ 脳 distance. Within 20 m of chicken habitat, MJ caused serious damage to vegetation. The community height, coverage and aboveground biomass were significantly lower than those in CK.20~60 m. The species richness of MJ was due to the nutrient addition effect of MJ. Coverage and aboveground biomass were significantly higher than those in CK,MJ year by 54.7% and 43.22% respectively in the second year, which was similar to that in the first year. When the distance is more than 60 m, MJ has no significant effect on vegetation. MJ will cause uneven distribution of chickens and serious destruction of vegetation near habitat, so it is not suitable to be used in coupling model of livestock, poultry and grass. In the actual production process, the density should be moderate and even distribution should be achieved as far as possible, the effect of nutrient addition should be brought into full play, and the growth and restoration of vegetation should be promoted.
【作者單位】: 中國科學院植物研究所植被與環(huán)境變化國家重點實驗室;中國環(huán)境科學研究院;
【基金】:國家自然科學基金(批準號:31400338,31270572) 國家重點研發(fā)計劃(批準號:2016YFC0500708) 中國科學院戰(zhàn)略性先導科技專項(批準號:XDA05070102)資助
【分類號】:S831
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