苜蓿栽培草地微生物C、N及呼吸特性对不同播种量的响应

doi:10.11686/cyxb2017321

草业学报 ›› 2018, Vol. 27 ›› Issue (3): 135-143.DOI: 10.11686/cyxb2017321

苜蓿栽培草地微生物C、N及呼吸特性对不同播种量的响应

王笛¹, 逄焕成¹, 李达¹, 陈金强¹, 辛晓平¹, 徐丽君^{1, *}, 唐雪娟¹, 郭明英², 朱树声³

1.中国农业科学院农业资源与农业区划研究所,呼伦贝尔国家野外站,北京100081;
2.呼伦贝尔市草原工作站,内蒙古海拉尔021200;
3.牙克石市草原工作站,内蒙古牙克石022150;

收稿日期:2017-08-10 修回日期:2017-10-26 出版日期:2018-03-20 发布日期:2018-03-20
通讯作者: * E-mail:xulijun_nmg@163.com
作者简介:王笛(1991-),女,满族,吉林长春人,硕士。E-mail:329906107@qq.com
基金资助:
“重点研发计划”(2016YFC0500603),“973”人工草地生产力形成机理与调控途径(2015CB150803),现代农业产业技术体系建设专项资金(Cars-34)和中央级公益性科研院所基本科研业务费专项(647-53)资助

Response of microbial C, N and respiration characteristics to sowing rates in alfalfa cultivation grasslands in Hulunber, Inner Mongolia

WANG Di¹, PANG Huan-cheng¹, LI Da¹, CHEN Jin-qiang¹, XIN Xiao-ping¹, XU Li-jun^1,*, TANG Xue-juan¹, GUO Ming-ying², ZHU Shu-sheng³

1.Institute of Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences, Hulunber Grassland Ecosystem Observation and Research Station, Beijing 100081, China;
2.Hulunber Grassland Ecosystem Observation and Research Station, Hailar 021200, China;
3.Yakeshi Grassland Ecosystem Observation and Research Station, Yakeshi 022150, China;

Received:2017-08-10 Revised:2017-10-26 Online:2018-03-20 Published:2018-03-20

摘要/Abstract

摘要： 以内蒙古呼伦贝尔地区种植的苜蓿为研究对象,分别于2015年7和9月,针对5种不同播种量(6,9,12,15和18 kg·hm^-2)条件下苜蓿栽培草地微生物特性及呼吸特性展开研究。结果表明,地上生物量与地下生物量在播种量为12 kg·hm^-2时达到最大值,微生物生物量碳7月的10~20 cm土层与9月的0~10 cm和10~20 cm土层均在播种量为18 kg·hm^-2时达到最大值,微生物量碳在7月整体高于9月,而土层0~10 cm两月间差距较大,土层10~20 cm差距较小,微生物生物量氮与碳表现出相似的变化规律,微生物量氮在7月整体高于9月;呼吸熵与微生物呼吸变化趋势一致,其中播种量为12 kg·hm^-2时呼吸熵值最低;在7和9月播种量为18和12 kg·hm^-2时呼吸强度与呼吸熵无显著差异;土壤微生物碳、微生物呼吸、呼吸熵对苜蓿不同播种量的种植方式有一定的响应作用;不同播种量结合植株生物量、土壤微生物呼吸、呼吸熵等指标,结果为播种量18 kg·hm^-2时效果最好。

Abstract: This study investigated changes in microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and the respiration characteristics of alfalfa under 5 different sowing rates (6, 9, 12, 15 and 18 kg·ha^-1). The study was undertaken from July to September 2015 in Hulunber, Inner Mongolia. The results showed that aboveground and underground biomass reached the maximum when the sowing amount was 12 kg·ha^-1. The highest MBC value appeared at 18 kg·ha^-1 sowing quantity among all soil layers and months. As a whole, the value of MBC presented higher in July than September, with this difference more significant at the 0-10 cm than 10-20 cm soil layers. MBN values also presented higher in July than September. Changes in soil respiration entropy (qCO₂) were coincident with microbial respiration, with the lowest qCO₂ levels appearing in the 12 kg·ha^-1 sowing treatment. There were no significant differences in microbial respiration and qCO₂ between the 18 kg·ha^-1 and 12 kg·ha^-1 treatments in July and September. We found that MBC, microbial respiration and qCO₂ varied according to the sowing rate of alfalfa. To summarize, taking into consideration such factors as aboveground biomass, microbial respiration and qCO₂, our study suggests that the best sowing quantity for alfalfa cultivation in Hulunber is 18 kg·ha^-1.

王笛, 逄焕成, 李达, 陈金强, 辛晓平, 徐丽君, 唐雪娟, 郭明英, 朱树声. 苜蓿栽培草地微生物C、N及呼吸特性对不同播种量的响应[J]. 草业学报, 2018, 27(3): 135-143.

WANG Di, PANG Huan-cheng, LI Da, CHEN Jin-qiang, XIN Xiao-ping, XU Li-jun, TANG Xue-juan, GUO Ming-ying, ZHU Shu-sheng. Response of microbial C, N and respiration characteristics to sowing rates in alfalfa cultivation grasslands in Hulunber, Inner Mongolia[J]. Acta Prataculturae Sinica, 2018, 27(3): 135-143.

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苜蓿栽培草地微生物C、N及呼吸特性对不同播种量的响应

Response of microbial C, N and respiration characteristics to sowing rates in alfalfa cultivation grasslands in Hulunber, Inner Mongolia

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