本文選題：馬尾松林 + 凋落葉　； 參考：《生態(tài)環(huán)境學報》2017年10期

【摘要】：研究外源性氮和磷對馬尾松(Pinus massoniana)凋落葉分解速率、分解過程中N、P、K含量變化及馬尾松林地土壤生化特性的影響,為闡明外源性氮和磷對凋落葉分解土壤養(yǎng)分的影響及為森林養(yǎng)分管理提供科學依據。采用尼龍網袋分解法,在廣東馬尾松林內建立4塊5 m×5 m的小樣地,放置凋落葉樣品,測定其分解速率和N、P、K含量變化。結果表明,施N對馬尾松凋落葉的分解有抑制作用,施P及N+P對凋落物的分解速率有不同程度的促進,其中施P處理的分解最快;分解24個月后,對照,施N、P和N+P的馬尾松純凋落葉分解率分別為90%,74%、98%和97%。施N、P和N+P的馬尾松林地凋落葉N含量顯著大于凋落葉的初始N含量,分解24個月后各處理凋落葉的N含量分別增加了18%、34%、23%和38%;各處理凋落葉P含量在分解過程中呈現上升的趨勢,分解24個月后凋落葉的P含量分別顯著增加了27%、21%、163%和144%,P和N+P處理的凋落葉P含量上升幅度大;而凋落葉K含量無明顯變化規(guī)律。施N和N+P顯著增加了土壤的全P和有效P含量,增量分別為4%、14%和23%、222%;加P顯著增加土壤了全P、全K和有效P含量,增量分別為18%、6%和277%。施N、施P和施N+P 3種處理顯著增加了土壤細菌、真菌和放線菌數量,加P提高了脲酶、磷酸酶及過氧化氫酶活性,增量分別為11%、17%和16%,施N+P提高了磷酸酶和過氧化氫酶活性,增量分別為7%和2%。綜上所述,施N抑制馬尾松凋落葉的分解,而施P及N+P促進凋落物的分解。在馬尾松林施用P肥可以促進凋落葉的分解和養(yǎng)分循環(huán)。
[Abstract]:To study the effects of exogenous nitrogen and phosphorus on the decomposition rate of Pinus massoniana leaves, the changes of N ~ (2 +) P ~ (+) K content and the soil biochemical characteristics of Pinus massoniana forest land during the decomposition process of Pinus massoniana (Pinus massoniana). In order to elucidate the effects of exogenous nitrogen and phosphorus on the decomposition of soil nutrients from litter leaves and provide scientific basis for forest nutrient management. Four plots of 5 m 脳 5 m small plots were established in Pinus massoniana forest in Guangdong Province by Nylon net bag decomposition method. The litter leaf samples were placed, and the decomposition rate and the change of N ~ (2 +) P ~ (+) K content were measured. The results showed that application of N could inhibit the decomposition of litter leaves of Pinus massoniana, and P and N P could promote the decomposition rate of litter in varying degrees, among which P application was the fastest, and after 24 months, the control. The decomposition rates of pure litter leaves of Pinus massoniana treated with N P and N P were 98% and 97%, respectively. The N content of litter leaves of Pinus massoniana forest applying N P and N P was significantly higher than the initial N content of litter leaves. After 24 months of decomposition, the N content of litter leaves increased by 18% and 38%, respectively, and the P content of litter leaves increased during decomposition. After 24 months of decomposition, P content in litter leaves increased significantly by 270.21% and 144%, respectively, and the P content of litter leaves increased by 144% and 144%, respectively, but there was no obvious change of K content in littered leaves. Application of N and N P significantly increased the total P and available P contents of the soil, the increments were 414% and 232.22%, respectively, and the total P, the total K and the available P contents of the soil increased significantly with the addition of P, the increments were 18.6% and 277B, respectively. Application of N, P and N P significantly increased the number of bacteria, fungi and actinomycetes, and increased the activities of urease, phosphatase and catalase by 1117% and 16%, respectively. The increments were 7% and 2%, respectively. In conclusion, N application inhibited litter decomposition of Pinus massoniana, while P and N P promoted litter decomposition. The application of P fertilizer in Pinus massoniana forest could promote the decomposition and nutrient cycling of litter leaves.
【作者單位】： 華南農業(yè)大學林學與風景園林學院;
【基金】：中央財政林業(yè)科技推廣示范項目(2015-GDTK-07)
【分類號】：S714

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