發(fā)布時間：2019-07-06 12:07

【摘要】：以短花針茅荒漠草原為研究對象,在不同施肥處理條件下采用LI-8100碳通量測量儀和暗箱方法研究了土壤呼吸速率的季節(jié)變化與年際動態(tài)、溫室氣體排放通量的季節(jié)變化、以及它們與其它影響因子之間的關(guān)系,其結(jié)果如下：1.土壤呼吸速率(1)施氮肥提高土壤呼吸速率,其大小關(guān)系表現(xiàn)為N10CKN5N2.5;N、P、 NP小區(qū),NP配施顯著提高了土壤呼吸速率,三者大小關(guān)系為NPPCKN10;(2)隨著溫度升高,土壤呼吸速率隨之增加并在7月中旬和8月中旬達(dá)到峰值,與未施肥小區(qū)相比,施肥并沒有改變土壤呼吸速率的變化規(guī)律；(3)土壤呼吸速率與5 cm土壤溫度及0-10 cm土壤含水量正相關(guān),荒漠草原主要影響土壤呼吸速率因子為土壤溫度和土壤含水量。2.生態(tài)系統(tǒng)溫室氣體通量(1)在三個不同N梯度小區(qū)內(nèi),CH4吸收通量大小關(guān)系為CKN2.5N10N5, CO2排放通量大小關(guān)系為N5CKN10N2.5, N20排放通量大小關(guān)系為CKN5 N2.5N10;在N、P、NP三個施肥小區(qū)內(nèi),CH4吸收通量大小關(guān)系為PCK NPN10, CO2排放通量大小關(guān)系為NPPCKN10, N20排放通量大小關(guān)系為CKNPPN10;(2)在整個生長季,與為施肥小區(qū)相比,施肥并沒有改變溫室氣排放通量的變化規(guī)律,在7月分別達(dá)到了吸收和排放峰值；(3)溫室氣體通量與土壤5 cm地溫及0～10cm土壤含水量顯著相關(guān),主要影響溫室氣體排放通量的環(huán)境因子為土壤溫度和土壤含水量。
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圖片說明：圖１研究區(qū)布置逡逑Ｆｉｇ．邋１邋Ｔｈｅ邐ｓｔｕｄｙ邋ａｒｅａ邋ｌａｙｏｕｔ逡逑
[Abstract]:The seasonal variation of soil respiration rate and interannual dynamics, the seasonal variation of greenhouse gas emission flux, and the relationship between them and other influencing factors were studied by LI-8100 carbon flux measuring instrument and dark box method under different fertilizer treatment conditions. The results are as follows: (1) the seasonal variation of soil respiration rate and interannual dynamics, the seasonal variation of greenhouse gas emission flux, and the relationship between them and other influencing factors are as follows: 1. Soil respiration rate (1) nitrogen fertilizer increased soil respiration rate, the relationship between soil respiration rate was N10CKN5N2.5 N2.5, P, NP plot, NP combined application significantly increased soil respiration rate, the relationship was NPPCKN10; (2) with the increase of temperature, soil respiration rate increased and reached the peak in mid-July and mid-August. Compared with unfertilized plot, fertilizer did not change the change of soil respiration rate. (3) soil respiration rate was positively correlated with 5 cm soil temperature and 0 鈮，

本文編號：2510994