【摘要】：秋末春初,中高緯度和高海拔地區(qū)普遍存在凍融現(xiàn)象。隨著全球氣候變暖,凍融對(duì)土壤碳/氮循環(huán)過程的影響日益受到重視。本研究以長(zhǎng)白山地區(qū)典型闊葉紅松林(Pinus koraiensis)、白樺林(Betula platyphylla)和長(zhǎng)白山落葉松林(Larix olgensis)土壤為研究對(duì)象,采用室內(nèi)模擬控制試驗(yàn),研究低含水量(40%)和高含水量(過飽和)條件下,凍融循環(huán)(-10~10℃)對(duì)不同林型土壤碳/氮礦化作用的影響。結(jié)果表明,在不同含水量條件下(低含水量條件下的闊葉紅松林土壤除外),凍融處理均顯著降低土壤有機(jī)碳礦化速率,且土壤碳礦化速率隨凍融次數(shù)的增加而顯著降低。凍融與土壤水分對(duì)氮礦化存在交互影響;在低含水量條件下,凍融促進(jìn)土壤氮礦化作用;但在高含水量條件下,該影響不一致。本研究表明,秋末和春初的凍融循環(huán)對(duì)長(zhǎng)白山地區(qū)森林土壤碳、氮礦化過程有重要影響,且其影響程度很大程度上取決于凍融頻率和土壤含水量。
[Abstract]:In late autumn and early spring, freezing and thawing is common in mid-high latitudes and high altitude areas. With the global warming, the effect of freezing and thawing on soil carbon / nitrogen cycle has been paid more and more attention. In this study, the soil of typical broad-leaved Pinus koraiensis forest (Pinus koraiensis), birch forest (Betula platyphylla) and Larix gmelinii forest (Larix olgensis) soil in Changbai Mountain area was used as the research object, and the indoor simulated control experiment was used. The effects of freeze-thaw cycle (-10 ~ 10 鈩，

本文編號(hào)：2389892