Impacts of Pinewood Nematode Invasion on the Water Conservation Capacity of Pinus massoniana Forests in the Three Gorges Area of Hubei Province
[Objective]To reveal the changing trend of water conservation capacity of litter and soil layers after pinewood nematode invasion.[Methods]Based on four sites of uniform Pinus massoniana forests with various infection periods over time(0(non-invasion),6,10 and 16 years)of pinewood nematode inva-sion in the Three Gorges Area of Hubei Province,water conservation capacities of litter and soil layer in different forest stands were studied by cutting ring method,drying method and indoor immersion method.The water conservation capacities were also quantitatively compared by combining the effective retention capacity of litters and the effective water-holding capacity of soil in different invasion years.[Result]The results showed that:(1)There were no significant differences(P＞0.05)in the litter accumulation,effective retention and maximum water holding capacity of litter of P.massoniana forest in different invasion years by pinewood nematode,and the total thickness was 3.47～5.34 cm.The total accumulation was 6.11～9.62 t·hm-2,and the effective water retention capacity was 9.71～14.77 t·hm-2.(2)There were signi-ficant differences in soil water content,bulk density and non-capillary porosity of P.massoniana forest in different invasion years by pinewood nematode(P＜0.05).The capillary water capacity was 333.42～378.33 t·hm-2,and the maximum water-holding capacity was 386.27～461.20 t·hm-2.The effect-ive water-holding capacity(62.08 t·hm-2 and 50.08 t·hm-2)in 0～10 cm and 10～20 cm and maximum wa-ter-holding capacity(386.27 t·hm-2)in 10～20 cm soil layers of P.massoniana forest in 6 years of invasion were the smallest.(3)The comprehensive water holding capacity of litter and soil layer in 10 years of inva-sion(219.72 t·hm-2)was the largest,followed by non-invasion(191.85 t·hm-2),16 years(182.64 t·hm-2),6 years(121.86 t·hm-2).[Conclusion]In the short term,the water holding capacity of litter and soil layer of P.massoniana forest decrease,which affects the water conservation capacity of forest stand after the con-tinuous harm of pinewood nematode invasion in the Three Gorges Area of Hubei,but gradually recover with increasing years.Therefore,the prevention and control of pinewood nematode invasion should be strengthened in the future,to maintain and restore the water conservation function of P.massoniana forest in The Three Gorges Area.
pine wood nematodelittersoilwater conservationPinus massoniana
万方数据
维普
