不同治理模式对侵蚀退化马尾松林地土壤质量的影响

Impact of Different Management Patterns on Soil Quality of Eroded Degraded Pinus massoniana Forest

为了探讨不同治理模式对侵蚀退化马尾松林地土壤质量的影响,对小穴播草、等高草灌带、"老头松"改造、草-灌-乔4种治理模式下的土壤理化性质进行比较。结果表明:经过治理后,侵蚀退化马尾松林土壤孔隙状况得到了改善,土壤有机质、碱解氮、有效磷、速效钾等养分含量均有所增加。土壤质量综合指数显示,风水林(0. 86)>等高草灌带(0. 35)>草-灌-乔(0. 33)>"老头松"改造(0. 30)>小穴播草(0. 29)>未治理地(0. 11),治理区土壤质量比未治理地有了不同程度的提高,但离当地顶级群落(风水林)还有一定距离。建议对治理后的侵蚀退化马尾松林地继续进行施肥抚育,防止马尾松林地群落的再次退化。

In order to study the soil quality under the eroded degraded Pinus massoniana forests,it was analyzed the physical and chemical properties of soil under four management patterns including the seeding grass at small pitting,contour grass-brush belt,old pine rehabilitation,and herb-shrub-arbor mixing.The results showed that the soil porosity of Pinus massoniana forests was improved after management,the soil nutrient contents such as the organic matter,alkali nitrogen,available phosphorus and available potassium in soil were increased.Composite indexes of soil quality(QI) values were showed as:control(feng-shui forest)(0.86) > contour grass-brush belt(0.35) >herb-shrub-arbor mixing(0.33) > old pine rehabilitation(0.30) > seeding grass at small pitting(0.29) >control(not governance)(0.11),indicating that soil quality in the measured area had been effectively improved,whereas QI of the four management patterns were still much less than then control(feng-shui forest).So it is also suggested that fertilization and tending should be carried out for each pattern in order to prevent their community from being degraded again.