【摘要】：【目的】研究外源性N和P對火力楠Michelia macclurei和馬尾松Pinus massoniana凋落葉分解速率的影響,以及分解過程中的N、P、K含量變化,了解混合凋落葉分解對外源性N和P的響應(yīng)機(jī)制,為森林資源管理提供參考�！痉椒ā繉⒒鹆﹂婉R尾松混合凋落葉置于火力楠林地及馬尾松林地,分別設(shè)立4塊5 m×5 m的小樣方,噴施N、P和N+P,比較其分解速率及分解過程中的N、P、K含量變化�！窘Y(jié)果】在2種林地的不同處理下,24個月后,火力楠林地混合凋落葉殘留量為施N(4.99 g)對照(4.14 g)施N+P(2.17 g)施P(1.16 g),馬尾松林地混合凋落葉殘留量為施N(2.72 g)對照(1.21 g)施N+P(0.36 g)施P(0.16 g),施N對火力楠和馬尾松林下的混合凋落葉的分解有抑制作用;施P后兩者的混合凋落葉的分解速率均不同程度地有所加快;施N+P后兩者的混合凋落葉的分解速率也均加快,但慢于施P處理。馬尾松林下混合凋落葉殘留量均小于火力楠林下混合凋落葉殘留量。分解24個月后,火力楠林地施N、P和N+P的混合凋落葉N質(zhì)量分?jǐn)?shù)分別為13.72、12.34和13.70 g·kg~( 1),而馬尾松林地分別為12.63、13.46和14.54 g·kg~( 1),均顯著大于其凋落葉的初始N質(zhì)量分?jǐn)?shù)(9.90 g·kg~( 1));施P和N+P處理的火力楠林地混合凋落葉P質(zhì)量分?jǐn)?shù)由初始的0.38 g·kg~( 1)分別增至0.86和0.74 g·kg~( 1),而馬尾松林地混合凋落葉P質(zhì)量分?jǐn)?shù)由初始的0.38 g·kg~( 1)分別增至1.37和1.05 g·kg~( 1)。凋落葉K含量的變化無規(guī)律�！窘Y(jié)論】火力楠和馬尾松混交可促進(jìn)火力楠凋落葉分解,提高混合凋落葉的分解速率。
[Abstract]:[objective] to study the effects of exogenous N and P on the litter decomposition rate of Michelia macclurei and Pinus massoniana, and the change of N Pu K content in the process of decomposition, and to understand the response mechanism of mixed litter decomposition to exogenous N and P. To provide reference for forest resource management. [methods] four small plots of 5 m 脳 5 m were set up in the forest land of Photinia and Pinus massoniana, and the mixed litter leaves were sprayed with N P and N P, respectively, in the forest land of P. firewood and Pinus massoniana, 4 small plots of 5 m 脳 5 m were set up, respectively. The rate of decomposition and the change of N ~ (2 +) P ~ (2 +) K content in the process of decomposition were compared. [results] after 24 months, under different treatments of two kinds of forest land, The residual amount of mixed litterfall leaves in Photinia woodland was N (4.99 g), control (4.14 g), N P (2.17 g, P (1.16 g),). The residual amount of mixed litter in Pinus massoniana forest was N (2.72 g), control (1.21 g), N P (0.36 g) and P (0.16 g), which inhibited the decomposition of mixed litterfall leaves under the forest of Photinia and Pinus massoniana. After P application, the decomposition rate of mixed leaves accelerated to some extent, and the decomposition rate of mixed leaves increased after N P application, but slower than that of P treatment. The residual amount of mixed litter leaves in Pinus massoniana forest was lower than that in firewood. After 24 months of decomposition, the N content of mixed litter leaves was 13.72 kg~ (12.34) and 13.70 g kg~ (1), respectively, while that of Pinus massoniana was 12.63 g / kg~ and 14.54 g / kg~, respectively. All of them were significantly larger than the initial N content (9.90 g / kg~) (1);) of their litter leaves. The P content of mixed litter leaves increased from 0.38 g kg~ to 0.86 g kg~ and 0.74 g kg~ respectively under P and N P treatments. The P content of mixed litter leaves in Pinus massoniana forest increased from 0. 38 g kg~ to 1. 37 g kg~ and 1. 05 g kg~ respectively. [conclusion] the mixture of Photinia and Pinus massoniana could promote the leaf decomposition and increase the decomposition rate of mixed leaves.
【作者單位】： 華南農(nóng)業(yè)大學(xué)林學(xué)與風(fēng)景園林學(xué)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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