间伐对红松人工林细根生物量的影响

Effects of thinning on fine root biomass of Korean pine plantation

为探明间伐对红松人工林细根生物量的影响,该文以本溪县草河口镇40年生红松人工林为研究对象,通过获取不同间伐强度的红松细根,测定不同土层及不同根序的细根生物量。结果表明:随着间伐强度增加,红松活细根、死细根及总生物量均下降,而单株红松细根生物量随间伐强度增加而增加。不同间伐强度样地0~10 cm、10~20 cm土层活细根生物量及0~10 cm死细根生物量均随间伐强度增加而显著减少(P<0.05),10~20 cm土层死细根生物量差异不显著。各间伐强度样地,不同土层的红松细根生物量随根序等级增加而增加,0~10 cm土层不同等级细根生物量均高于10~20 cm土层。由此可知,红松人工林细根生物量随间伐强度增加而降低,适度间伐可以促进单株红松细根生长,提高林分空间利用效率,并增加表层土壤中低等级细根的比例。该研究结果可为辽东地区红松人工林可持续经营提供理论基础。

To investigate the impact of thinning on fine root biomass of Korean pine plantations,this study took 40-year-old Korean pine plantations in Caohekou Town,Benxi County as the research object.Fine roots of Korean pine with different thinning intensities were obtained,and fine root biomass of different soil layers and root orders was determined.The results showed that as the thinning intensity increased,the live fine root,dead fine root,and total biomass of Korean pine decreased,while the fine root biomass per plant increased with the increase of thinning in‐tensity.The live fine root biomass in the 0~10 cm and 10~20 cm soil layers and the dead fine root biomass in the 0~10 cm soil layer decreased significantly with the increase of thinning intensity(P<0.05),while the difference in dead fine root biomass in the 10~20 cm soil layer was not significant.In all plots with different thinning intensities,the fine root biomass of Korean pine in different soil layers increased with the increase of root order.The fine root biomass of different grades in the 0~10 cm soil layer was higher than that in the 10~20 cm soil layer.It can be con‐cluded that the fine root biomass of Korean pine plantations decreases with the increase of thinning intensity.Appro‐priate thinning can promote the growth of fine roots per plant,improve the space utilization efficiency of the stand,and increase the proportion of low-grade fine roots in the surface soil.The research results can provide a theoretical basis for the sustainable management of Korean pine plantations in the eastern Liaoning region.