Abstract
Objective The research aims to study the effects of different near-natural management measures on soil fertility under Pinus massoniana forests. Method In Kaiyang near-natural management project area of Guiyang City, the near-natural selective cutting, near-natural thinning, near-natural tending, and the control group were selected to comprehensively evaluate the impact of different management measures on soil fertility under P. massoniana forests. Result The mass fractions of organic matter, soil total nitrogen, alkali-hydrolyzed nitrogen, total potassium, total phosphorus, available phosphorus, urease, alkaline phosphatase in near-natural selective cutting were higher than those of the control group, showing an up-going trend. The mass fractions of organic matter, total nitrogen, alkali-hydrolyzed nitrogen, total potassium, total phosphorus, and available phosphorus were significantly different(P＜0.05). The mass fraction of soil organic matter, total nitrogen, alkali-hydrolyzed nitrogen, total potassium, available potassium, total phosphorus, available phosphorus, and sucrose in near-natural thinning was higher than that in the control group, showing an increasing trend, among which the mass fraction of total nitrogen, alkali-hydrolyzed nitrogen, total potassium, available potassium, total phosphorus and available phosphorus had significant differences (P＜0.05), but the mass fraction of urease showed a decreasing trend. The mass fraction of alkali-hydrolyzed nitrogen, total potassium, available phosphorus and urease in near-natural tending showed a decreasing trend, among which the difference between alkali-hydrolyzed nitrogen and total potassium was significant (P＜0.05), and the mass fraction of sucrose showed an increasing trend. The comprehensive evaluation scores of soil fertility in the P. massoniana stands with near-natural thinning and selective cutting were significantly different from those of the control group (P＜0.05), but the difference in tending was not significant (P＞0.05). The effect of different near-natural management measures on soil physical indexes was not significant (P＞0.05). Conclusion Near-natural thinning and selective cutting can significantly promote soil fertility of P. massoniana forests, which is of great significance for maintenance and improvement of soil fertility of P. massoniana forests. The effect of near-natural tending on forest stands is not significant. The near-natural management theory plays an important role in improving forest soil fertility and sustainable forest management in Guiyang. [Ch, 1 fig. 6 tab. 19 ref.]
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