本文關鍵詞：喀斯特地區(qū)不同年限桂牧1號象草草地土壤養(yǎng)分特征　出處：《草業(yè)科學》2016年01期 　論文類型：期刊論文

  更多相關文章： 喀斯特地區(qū) 桂牧號 土壤養(yǎng)分 土壤有機碳 土壤微生物生物量碳

【摘要】：人為干擾和管理措施對喀斯特地區(qū)生態(tài)恢復影響顯著。本研究以典型喀斯特地區(qū)種植1年(1-y G)、5年(5-y G)和7年(7-y G)的桂牧1號雜交象草(Pennisetum purpureum cv.Guimu-1)栽培草地為研究對象,以玉米(Zea mays)種植地(CK)作為對照,分析不同建植年限下栽培草地對地上部分生物量、土壤養(yǎng)分含量及微生物量碳的影響。結果表明,1)建植年限對桂牧1號草地地上部分生物量影響顯著(P0.05),表現(xiàn)為7-y G1-y G5-y G。2)桂牧1號草地0-50cm土層土壤N、P、K隨建植年限呈現(xiàn)先下降后升高的趨勢,建植5年的牧草地土壤N、P、K養(yǎng)分含量普遍較低;土壤有機碳含量在各土層均以建植7年草地最高,5年草地最低。土壤表層(0-10 cm)微生物生物量碳表現(xiàn)為1-y G5-y G7-y G,且7年草地分別比1年和5年草地增加了32.37%和19.18%。3)桂牧1號草地土壤有機碳、全氮、全磷、全鉀含量及土壤表層微生物生物量碳均高于相應土層玉米地,而堿解氮、速效磷和速效鉀含量則剛好相反。因此,相比玉米農耕地,桂牧1號栽培草地能有效提高喀斯特地區(qū)土壤肥力,其中,以建植7年的草地固碳效果最好,"種草養(yǎng)畜"是喀斯特地區(qū)生態(tài)恢復與重建的有效措施。
[Abstract]:Anthropogenic disturbance and management measures had a significant impact on ecological restoration in karst areas. In this study, 1-y G was planted for 1 year in typical karst areas. Penisetum purpureum cv. Guimu-1. Cultivated grassland was studied. The effects of different planting years on biomass, soil nutrient content and microbial biomass carbon were analyzed in maize (Zea mays) planting field (CK). 1) the effect of planting years on aboveground biomass of Guimu No.1 grassland was significant (P0.05). The results showed that the N ~ (+ +) P ~ (+) K in 0-50cm soil layer of No. 1 Guimu grassland decreased first and then increased with the planting years. The nutrient content of N ~ (2 +) P ~ (+) K in the soil of forage land established for 5 years was generally low. The soil organic carbon content in all soil layers was the highest in 7 years grassland, the lowest in 5 years grassland, and 0-10 cm in topsoil layer. The microbial biomass carbon was 1-y G5-y G7-y G. The soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (P) were increased by 32.37% and 19.18. 3 respectively in 7 years compared with 1 year and 5 years. The total potassium content and soil surface microbial biomass carbon were higher than the corresponding soil layer corn field, but the alkali hydrolyzed nitrogen, available phosphorus and available potassium content were just the opposite. Therefore, compared with maize farming land. The cultivated grassland of Guimu No. 1 can effectively improve soil fertility in karst area, among which, the grassland established for 7 years has the best effect on carbon sequestration. "recommended livestock raising" is an effective measure for ecological restoration and reconstruction in karst area.
【作者單位】： 中國科學院亞熱帶農業(yè)生態(tài)研究所亞熱帶農業(yè)生態(tài)過程重點實驗室;中國科學院環(huán)江喀斯特生態(tài)系統(tǒng)觀測研究站;中國科學院大學;
【基金】：中國科學院科技服務網絡計劃(STS計劃)“廣西喀斯特區(qū)生態(tài)服務提升與民生改善研究示范(KFJ-EW-STS-092)” 國家自然科學基金(41471445)
【分類號】：S812.2
【正文快照】： k騫鷂鞅笨λ固氐厙俏夜饕炒噯醮，

本文編號：1430218