喀斯特地区不同年限桂牧1号象草草地土壤养分特征
发布时间：2018-01-15 22:00
本文关键词：喀斯特地区不同年限桂牧1号象草草地土壤养分特征 出处：《草业科学》2016年01期 论文类型：期刊论文
更多相关文章： 喀斯特地区 桂牧号 土壤养分 土壤有机碳 土壤微生物生物量碳
【摘要】：人为干扰和管理措施对喀斯特地区生态恢复影响显著。本研究以典型喀斯特地区种植1年(1-y G)、5年(5-y G)和7年(7-y G)的桂牧1号杂交象草(Pennisetum purpureum cv.Guimu-1)栽培草地为研究对象,以玉米(Zea mays)种植地(CK)作为对照,分析不同建植年限下栽培草地对地上部分生物量、土壤养分含量及微生物量碳的影响。结果表明,1)建植年限对桂牧1号草地地上部分生物量影响显著(P0.05),表现为7-y G1-y G5-y G。2)桂牧1号草地0-50cm土层土壤N、P、K随建植年限呈现先下降后升高的趋势,建植5年的牧草地土壤N、P、K养分含量普遍较低;土壤有机碳含量在各土层均以建植7年草地最高,5年草地最低。土壤表层(0-10 cm)微生物生物量碳表现为1-y G5-y G7-y G,且7年草地分别比1年和5年草地增加了32.37%和19.18%。3)桂牧1号草地土壤有机碳、全氮、全磷、全钾含量及土壤表层微生物生物量碳均高于相应土层玉米地,而碱解氮、速效磷和速效钾含量则刚好相反。因此,相比玉米农耕地,桂牧1号栽培草地能有效提高喀斯特地区土壤肥力,其中,以建植7年的草地固碳效果最好,"种草养畜"是喀斯特地区生态恢复与重建的有效措施。
[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.
【作者单位】： 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室;中国科学院环江喀斯特生态系统观测研究站;中国科学院大学;
【基金】：中国科学院科技服务网络计划(STS计划)“广西喀斯特区生态服务提升与民生改善研究示范(KFJ-EW-STS-092)” 国家自然科学基金(41471445)
【分类号】：S812.2
【正文快照】： k骞鹞鞅笨λ固氐厍俏夜饕炒嗳醮，
本文编号：1430218
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