本文選題：溶解態(tài)有機碳 + 溶解態(tài)氮��； 參考：《北京林業(yè)大學(xué)學(xué)報》2016年09期

【摘要】：為探明熱帶季節(jié)雨林土壤溶解態(tài)有機碳(DOC)、溶解態(tài)氮(DN)的時空動態(tài)及與土壤溫、濕度和土壤酸度的關(guān)系,本研究在西雙版納熱帶季節(jié)雨林開展了土壤剖面DOC和DN含量的研究,在同一自然年度,在霧涼季(1月),干季(3月),雨季前期(5月),雨季中期(8月),雨季后期(10月),按0~20、20~40、40~60、60~80和80~100 cm分層采集土壤樣品,測定土壤DOC和DN含量、土壤溫、濕度和酸度。結(jié)果表明:西雙版納熱帶季節(jié)雨林土壤DOC和DN含量在0~60 cm隨深度增加而逐層遞減,在60~100 cm則隨著深度增加而增加,總體表現(xiàn)為表層DOC和DN含量較深層土壤含量高的剖面特征。熱帶季節(jié)雨林各層土壤的DOC和DN的季節(jié)動態(tài)并不完全一致,呈雨季中后期高,干季低的季節(jié)特征。即DOC含量季節(jié)差異顯著的土層為0~20和20~40 cm,而DN含量僅在0~20 cm土層季節(jié)差異顯著;土壤溫濕度與DOC和DN的關(guān)系存在著層間差異,即0~20和20~40 cm土壤DOC的含量與土壤濕度呈顯著正相關(guān)關(guān)系;20~40 cm的DOC含量與土壤溫度呈顯著正相關(guān)關(guān)系;0~20和80~100 cm土層的DN含量與土壤濕度有顯著的正相關(guān)關(guān)系;僅0~20 cm土層的土壤溫度與DN含量呈顯著正相關(guān)關(guān)系;熱帶季節(jié)雨林土壤DOC和DN的含量與土壤酸度的關(guān)系不顯著。以上結(jié)果表明熱帶季節(jié)雨林各層土壤的DOC和DN對溫、濕度和酸度的反饋不同。
[Abstract]:In order to find out the temporal and spatial dynamics of dissolved organic carbon (DOC) and dissolved nitrogen (DN) in tropical seasonal rainforest and their relationship with soil temperature, humidity and soil acidity, the DOC and DN contents of soil profile were studied in the tropical seasonal rainforest of Xishuangbanna, Xishuangbanna.In the same natural year, soil samples were collected in the fog cool season (January), dry season (March), early rainy season (May), middle rainy season (August), late rainy season (October), stratified soil samples were collected according to 0 ~ 20 ~ 20 ~ 20 ~ 40 ~ (40) ~ 40 ~ (60) ~ (60) ~ (60) ~ (60) ~ (60) and 80 ~ (100) cm, soil DOC and DN contents, soil temperature, humidity and acidity were determined.The results showed that the contents of DOC and DN in the tropical seasonal rainforest soil in Xishuangbanna decreased layer by layer with the increase of depth at 0 ~ 60 cm, and increased with the increase of depth at 60 ~ 100 cm, showing that the content of DOC and DN in the surface layer was higher than that in the deep layer.The seasonal dynamics of DOC and DN in the tropical seasonal rain forest soils are not completely consistent, showing the seasonal characteristics of high in the middle and late rainy season and low in the dry season.That is to say, the seasonal difference of DOC content in soil layer is 0 ~ 20 cm and 20 ~ 20 cm, while DN content is only significantly different in 0 ~ 20 cm soil layer, and the relationship between soil temperature and humidity and DOC and DN is different between layers.There was a significant positive correlation between the content of DOC and soil moisture in 0 ~ 20 cm and 20 ~ 40 cm soil layer. The DOC content of 20 ~ 40 cm soil layer and the soil temperature showed a significant positive correlation with soil moisture content. There was a significant positive correlation between DOC content and soil moisture content in 0 ~ (20) and 20 ~ (10) ~ (10) cm soil layer.There was a significant positive correlation between soil temperature and DN content in 0 ~ 20 cm soil layer, but no significant relationship between soil DOC and DN content and soil acidity in tropical seasonal rainforest soil.The above results indicate that DOC and DN have different feedback on temperature, humidity and acidity in different layers of tropical seasonal rainforest soil.
【作者單位】： 中國科學(xué)院西雙版納熱帶植物園 西雙版納熱帶森林生態(tài)系統(tǒng)研究站;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金項目(U1202234、31290221、40801035) 中國科學(xué)院科技先導(dǎo)項目(XDA05020302、XDA05050601);中國科學(xué)院135項目(XTBG-F01) 熱帶森林生態(tài)學(xué)重點實驗室項目(09KF001B04)
【分類號】：S714

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