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以典型黑土区樟子松人工林、水曲柳人工林、美青杨人工林以及天然草地为研究对象,通过对最大吸附磷量(Qm)、磷吸持指数(PSI)、易解吸磷(RDP)及解吸量等指标的测定、计算和分析,研究了水土保持林土壤磷的吸附-解吸特性。结果表明:0~40 cm土层范围内,林地土壤的磷最大吸附量(Qm)在636.54~725.77 mg kg-1范围内,磷吸持指数(PSI)、吸附强度因子(K)和最大缓冲容量(MBC)均显著低于天然草地(P<0.05);林地能够显著增加土壤磷的解吸量和解吸率,土壤易解吸磷(RDP)是天然草地的3.06~4.63倍(P<0.05);可以认为水土保持林能够降低土壤对磷的吸附,增加磷的解吸程度,进而提高磷的利用率,并以阔叶林的作用效果最为显著。研究结果可为黑土区水土保持林建设与植被恢复效果评价提供参考。
In this study, the Pinus sylvestris var. Mongolica plantation, Fraxinus mandshurica plantation, Populus simonii plantation and natural grassland in a typical black soil area were selected to study the effects of maximum phosphorus uptake (Qm), phosphorus uptake index (PSI) RDP), desorption amount and other indicators were measured, calculated and analyzed, and the adsorption and desorption characteristics of soil phosphorus in soil and water conservation forest were studied. The results showed that within 0-40 cm soil layer, the maximum phosphorus uptake (Qm) of soil in the soil ranged from 636.54 to 725.77 mg kg-1, and the PSI, K and maximum buffering (MBC) were significantly lower than that of natural grassland (P <0.05). The woodland could significantly increase the desorption and desorption rates of soil P, and the soil easy desorption phosphorus (RDP) was 3.06 ~ 4.63 times of that of natural grassland (P <0.05). It can be considered that soil and water conservation forest can reduce the adsorption of phosphorus to soil, increase the degree of desorption of phosphorus and further improve the utilization rate of phosphorus, and the effect of broad-leaved forest is the most obvious. The results can provide reference for the evaluation of soil and water conservation forest construction and vegetation restoration in black soil areas.