中小型土壤动物组成对复垦铜尾地土壤养分的影响

通过盆钵生物试验研究了中小型土壤动物不同类群的组成对复垦铜尾矿废弃地土壤养分的影响。整个培养试验根据需求对不同中小型土壤动物组合设置四个处理措施,每种措施分为有无凋落物两种水平,即:(1)无土壤动物(Re),无土壤动物+凋落物(Re+Li)(2)跳虫(Co),跳虫+凋落物(Co+Li)(3)跳虫+蜱螨类(Co+Ac),跳虫+蜱螨类+凋落物(Co+Ac+Li)(4)中小型土壤动物(剔除大型土壤动物Me),中小型土壤动物+凋落物(Me+Li)。另设一组对照(CK)处理,并于培养实验开始前完成测定,作为本底值。分析表明,土壤p H随着中小型土壤动物类群的增加而降低,最低值出现在Me和Me+Li处理,且二者之间无显著性差异;对照(CK)处理下的各养分含量均显著低于其他各处理,各处理中有机质、有效磷和水解性氮的含量的最大值均出现Me+Li处理,且与其他各处理呈极显著差异(P0.01);土壤全磷含量最大值出现在Re和Me+Li处理,最低值出现在Co+Li处理且之间呈显著差异(P0.05);土壤全氮含量最大值出现在Co+Ac和Me+Li处理,最低值出现在Co+Ac+Li处理且彼此间也呈显著差异(P0.05)。相关分析表明,有机质与有效磷以及全氮与水解性氮之间相关性达到极显著正相关关系(r=0.886,r=0.898),有机质与全氮及水解性氮分别呈现显著正相关关系(r=0.735,r=0.780),全氮与有效磷(r=0.782)以及有效磷与水解性氮(r=0.755)也呈现显著正相关关系。p H与有机质呈现显著负相关关系(r=-0.782),全磷与有机质、全氮、有效磷、水解性氮均无相关关系。

Influence of meso-and micro-fauna composition on soil nutrient dynamics in reclaimed soil in copper tailings

Influence of meso-fauna and micro-fauna composition on soil nutrient dynamics in reclaimed soil in copper tailings is studied by pot experiments. The pot experiments in laboratory were constructed consisting of mineral soil and litter: taken from a reclaimed site with naturally developed vegetation (Imperata cylindrica (Linn.) Beauv).The litter were inoculated with four different types of decomposer community: 1. Remove soil fauna(Re), Remove soil fauna+Litter(Re+Li), 2. Collembola(Co), Collembola+ Litter(Co+Li), 3. Collembola+ Acarina(Co+Ac), Collembola + Acarina + Litter(Co+Ac+Li), 4. Mesofauna(Remove soil macrofauna Me), Mesofauna + Litter(Me+Li). A group of Control Check (CK) treatment was set up, which will be completed before cultivation experiment, it will be compared with after-cultivating soil nutrients. Under the composition of different meso-fauna and micro-fauna and their interaction with litter, their effects on the soil pH, organic matter, total phosphorus, total nitrogen, available phosphorus and hydrolysable nitrogen were anslyzed. Results indicated: soil pH value will decrease with the increase of meso-fauna and micro-fauna group, the lowest is in Me treatment and Me+Li treatment, there is no significant impact between them. Nutrient content under CK treatment is significantly lower than those in other treatments. The highest content of organic matter, available phosphorus and hydrolysable nitrogen are in Me+Li treatment, and extremely significant difference was appeared between CK treatment and the other treatments P < 0.01. The highest content of total phosphorus is in Re and Me+Li treatment and the lowest is in Co+Li treatment, and significant difference is appeared between them P < 0.05. The highest content of total nitrogen is in Co+Ac and Me+Li treatment and the lowest is in Co+Ac+Li treatment, also there appear significant difference P < 0.05. And correlation analysis indicates that the correlation between organic matter and available phosphorus is closely positively correlated (r=0.886); total nitrogen and hydrolysable nitrogen (r=0.898) shows significantly positive correlation; organic matter and total nitrogen and hydrolysable nitrogen show a significantly positive correlation (r=0.735, r=0.780); total nitrogen and available phosphorus (r=0.782), available phosphorus and hydrolytic nitrogen (r=0.755) also show significant positive correlation. Organic matter and pH have a closely negative correlation (r=-0.782), and there was no correlation between total phosphorus and organic matter, total nitrogen, available phosphorus, and hydrolysable nitrogen. Through, analysis of the research, it can further reveal that type of composition of meso-fauna and micro-fauna can make the greatest contribution to the development of soil nutrient. And it can reveal the changes of the largest contribution ability groups under different nutrient indicators. It can provide evidences for the returning of soil nutrients in reclaimed soil in copper tailings and the ecological reconstruction.