本文選題：土層深度 + 土壤碳礦化速率��； 參考：《土壤通報(bào)》2017年05期

【摘要】：土壤碳礦化速率及溫度敏感性是研究陸地生態(tài)系統(tǒng)碳循環(huán)的重要指標(biāo),以往研究多集中在表層土壤,但不同深度土壤屬性及碳質(zhì)量具有顯著的差異。以亞熱帶馬尾松/木荷人工混交林紅壤為研究對(duì)象,選擇0~10 cm、10~30 cm、30~60 cm和60~100 cm四種深度土壤,設(shè)置葡萄糖添加(G+)和空白對(duì)照(CK)兩組處理,進(jìn)行周期性變溫(4、14、22和30℃)培養(yǎng),并利用自主研發(fā)設(shè)備測(cè)定第1、3、7、14、21和28天5~30℃模擬晝夜周期性變溫條件下的土壤碳礦化速率,研究添加葡萄糖對(duì)不同紅壤碳礦化速率及其溫度敏感性(Q10)的影響。結(jié)果表明:無(wú)葡萄糖添加時(shí),隨著土壤深度和培養(yǎng)時(shí)間增加,土壤碳礦化速率顯著降低,但Q10無(wú)顯著差別,培養(yǎng)后期底物供給不足限制了土壤碳礦化速率。葡萄糖添加后,隨著土壤深度增加,土壤碳礦化速率及Q10均顯著增加,淺層土壤響應(yīng)較快,深層土壤響應(yīng)慢但增幅更大。培養(yǎng)末期深層土壤碳礦化速率甚至高于表層土壤。不同深度土壤微生物含量及其群落結(jié)構(gòu)組成是土壤碳礦化速率及其Q10響應(yīng)差異的主要影響因素。
[Abstract]:Soil carbon mineralization rate and temperature sensitivity are important indexes to study the carbon cycle in terrestrial ecosystem. In the past, most of the studies focused on the surface soil, but there were significant differences in soil properties and carbon quality among different depths. The red soil of artificial mixed forest of Pinus massoniana and Schima superba was used as the research object. Four kinds of soil depth, 0 ~ 10 cm ~ (10 cm) ~ (10 ~ (30) cm ~ (-1) ~ (30) cm ~ (-1) and 60 ~ (100) cm) were selected, and two groups of treatments (glucose + G) and blank control group (CK) were used to culture the soil with periodic variation of temperature (4 ~ (14) ~ (22) and 30 鈩，

本文編號(hào)：1921763