發(fā)布時間：2018-03-09 15:55

  本文選題：森林類型　切入點：可溶性有機質(zhì)　出處：《應(yīng)用生態(tài)學(xué)報》2016年04期 　論文類型：期刊論文

【摘要】：林分類型是影響土壤可溶性有機碳、氮庫大小的重要因素,但目前對其研究主要集中在表層土壤(0~10 cm).本研究以亞熱帶地區(qū)天然林、毛竹林、格式栲人工林和杉木人工林為對象,用3種不同的浸提方式(冷水、熱水和KCl溶液)提取表層(0~10 cm)和深層(40~60 cm)土壤中可溶性有機碳(DOC)和有機氮(DON),研究林分類型對表層和深層土壤可溶性有機碳、氮庫的影響.結(jié)果表明:林分類型對表層土壤DOC及其占土壤總有機碳(TOC)的比重有顯著影響,深層土壤受林分類型的影響不顯著;不同林分土壤DON含量僅在表層土壤存在顯著差異,在深層土壤差異不顯著.林分間土壤微生物生物量碳的差異僅在表層土壤達到顯著水平.DON占土壤總氮(TN)的比重在各林分表層和深層土壤間差異均不顯著.3種浸提方法得到的DOC和DON庫大小順序為熱水KCl冷水,不同浸提方法得到的DOC庫及DON庫的相關(guān)性均達到顯著水平,表明冷水、熱水和KCl溶液浸提得到的有機碳、氮庫含有相似組分.冷水和熱水浸提方法得到的表層土壤DOC和DON含量及DOC占TOC比重在天然林和毛竹林均顯著大于格式栲和杉木人工林,表明天然林和毛竹林土壤可溶性有機碳、氮含量高于格式栲和杉木人工林,更有利于土壤肥力的恢復(fù).
[Abstract]:Stand type is an important factor affecting the size of soil soluble organic carbon and nitrogen pool, but at present, the study is mainly focused on the surface soil of 10 cm ~ (10 cm). In this study, natural forest, Phyllostachys pubescens forest, plantations of Castanopsis fargesii and Chinese fir plantation in subtropical region were studied. Three different extraction methods (cold water, hot water and KCl solution) were used to extract soluble organic carbon (DOC) and organic nitrogen (DOC) from topsoil (10 cm) and deep layer (40 ~ 60 cm). The effects of stand types on soluble organic carbon (SOC) in topsoil and deep soil were studied. The results showed that stand type had a significant effect on the proportion of DOC in topsoil and its proportion to soil total organic carbon (TOC), but the deep soil was not affected by stand type. The DON content of different stand soils was significantly different only in the surface soil. The difference of soil microbial biomass carbon between stands reached significant level only in the surface soil. Don accounted for the proportion of soil total nitrogen and TNN. There was no significant difference in 3 kinds of extraction between different stand surface and deep soil. The DOC and DON libraries were obtained in the order of hot water, KCl and cold water. The correlation between DOC library and DON library obtained by different extraction methods was significant, indicating that organic carbon was extracted from cold water, hot water and KCl solution. The contents of DOC and DON in surface soil and the proportion of DOC to TOC in natural forest and Phyllostachys pubescens forest were significantly higher than those in normal Castanopsis fargesii and Cunninghamia lanceolata plantation, which indicated that the soil soluble organic carbon of natural forest and Phyllostachys pubescens forest was higher than that of Chinese fir plantation. Nitrogen content was higher than that of Castanopsis fargesii and Cunninghamia lanceolata plantation, which was more favorable for soil fertility recovery.
【作者單位】： 濕潤亞熱帶山地生態(tài)國家重點實驗室培育基地;福建師范大學(xué)地理科學(xué)學(xué)院;福建農(nóng)林大學(xué)林學(xué)院;
【基金】：國家自然科學(xué)基金項目(41371269) 國家重點基礎(chǔ)研究發(fā)展計劃項目(2014CB954003) 福建省杰出青年科學(xué)基金項目(2060203)資助~~
【分類號】：S714.2

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本文編號：1589212