本文選題：溶解性有機碳 + 排水造林�。� 參考：《環(huán)境科學學報》2016年07期

【摘要】：以小興安嶺濕地為研究對象,分析了不同年代排水造林的森林沼澤濕地土壤溶解性有機碳(DOC)含量變化及生物降解特征,探討了排水造林時間對土壤DOC及無機氮(NH+4-N+NO-3-N)淋溶動態(tài)變化的影響.結果表明:1排水造林時間對土壤DOC含量變化影響顯著(p0.05).2003年(PS03)、1992年(PS92)、1985年(PS85)排水造林后的人工興安落葉松濕地土壤DOC含量均低于未排水造林的天然興安落葉松苔草濕地(XATC),且排水造林時間越長,土壤DOC含量越少.2在生物降解過程中,土壤DOC的變化趨勢表現(xiàn)為初期降解速率較快,而后逐漸減慢并趨于穩(wěn)定.其中周轉時間為1 d的易降解DOC所占比重表現(xiàn)為:PS92XATCPS03PS85,表明排水時間達到一定閾值后,易降解DOC部分可能會轉化為難降解部分.3在淋溶過程中,隨著淋溶次數的增加,淋出液中DOC含量呈現(xiàn)為先增加后減小的趨勢,淋溶1 d后,不同年代排水造林的森林沼澤濕地土壤DOC的淋失率表現(xiàn)為:PS85PS92PS03XATC,表明排水造林時間越長,土壤DOC淋失率越大,因此長時間的排水造林改造可能進一步影響土壤養(yǎng)分的貯量及其有效性.
[Abstract]:Taking Xiaoxinganling wetland as the research object, the change of soil dissolved organic carbon (DOC) content and biodegradation characteristics of forest swamp wetland with different years of drainage afforestation were analyzed. The effects of reforestation time on the leaching dynamics of DOC and NH _ 4-N no _ 3-N in soil were studied. The results showed that the effect of reforestation time on soil DOC content was significant (p 0.05). The DOC content of artificial larch wetland after reforestation was lower than that of natural Larix gmelinii wetland after reforestation in 2003 (P < 0.05), P < 0.05 (P < 0.05). XATC, and the longer the drainage and afforestation time, In the process of biodegradation, the change trend of soil DOC content was that the degradation rate of soil DOC was faster at the initial stage, then slowed down and tended to be stable. The proportion of degradable DOC with a turnover time of 1 day was as follows: PS92XATCPS03PS85, which indicated that when the drainage time reached a certain threshold, the easily degradable part of DOC might be transformed into difficult degradation part. 3 in the process of leaching, with the increase of leaching times, The content of DOC in the leachate increased first and then decreased. After 1 day of leaching, the leaching rate of DOC in forested swamp wetland of different years was 1% PS85PS92PS03XATC, which indicated that the longer the time of drainage afforestation, the greater the leaching rate of DOC in soil. Therefore, long-term drainage afforestation may further affect the soil nutrient storage and its effectiveness.
【作者單位】： 黑龍江省普通高等學校地理環(huán)境遙感監(jiān)測重點實驗室哈爾濱師范大學;中國氣象影視制作中心;
【基金】：國家自然科學基金項目(No.41301082,4157012165) 黑龍江省博士后資助項目(No.LRB13-200)~~
【分類號】：S714
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本文編號：1859070