不同温度和CO2浓度生长环境下小麦麦秸的消化率研究

doi:10.11686/cyxb2016053

草业学报 ›› 2016, Vol. 25 ›› Issue (12): 111-118.DOI: 10.11686/cyxb2016053

不同温度和CO₂浓度生长环境下小麦麦秸的消化率研究

何香玉, 慕春龙, 蔡旻, 吴艳萍, 杨宇翔, 毛胜勇, 成艳芬^*, 朱伟云

江苏省消化道营养与动物健康重点实验室,南京农业大学动物科技学院消化道微生物研究室,江苏南京210095

收稿日期:2016-02-01 修回日期:2016-04-07 出版日期:2016-12-20 发布日期:2016-12-20
通讯作者: yanfencheng@njau.edu.cn
作者简介:何香玉(1989-),女,四川成都人,在读硕士。E-mail:hexiangyu@njau.edu.cn
基金资助:
公益性行业(农业)科研专项(200903003)资助

Effects of increased atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw

HE Xiang-Yu, MU Chun-Long, CAI Min, WU Yan-Ping, YANG Yu-Xiang, MAO Sheng-Yong, CHENG Yan-Fen^*, ZHU Wei-Yun

Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Laboratory of Gastrointestinal Microbiology, Nanjing Agricultural University, Nanjing 210095, China

Received:2016-02-01 Revised:2016-04-07 Online:2016-12-20 Published:2016-12-20

摘要/Abstract

摘要： 本试验以优良中筋小麦“扬麦14”为试验材料,在小麦整个生育期提高CO₂浓度和温度,分为4组:空白组,升温组,CO₂组,升温和CO₂混合组,空白组小麦生长平均温度10.5 ℃,CO₂浓度413 μmol/mol,升温组温度高于空白组2 ℃,CO₂组浓度500 μmol/mol,升温和CO₂混合组同时提高温度与CO₂浓度,收割时采集麦秸用于体内消化试验。用3头装有永久性瘤胃瘘管的荷斯坦奶牛,采用尼龙袋法评定温度和CO₂浓度升高环境下小麦秸瘤胃的降解特性。结果显示,与空白组相比,升温组DM快速降解部分显著升高(P<0.05),ADF降解率与ADF慢速降解部分显著降低(P<0.05);CO₂组DM,OM,NDF及ADF降解率均显著降低(P<0.05),且DM,OM与NDF有效降解率显著降低(P<0.05);混合组DM,OM,NDF及ADF降解率均显著降低(P<0.05),DM,OM及ADF慢速降解部分显著降低(P<0.05),DM,OM与NDF有效降解率显著降低(P<0.05)。不同处理后麦秸DM,OM,NDF与ADF瘤胃内降解率从高到低为空白组、升温组、CO₂组和混合组。综合以上结果表明,温度和CO₂浓度升高降低了麦秸DM,OM,NDF及ADF瘤胃内降解率,导致麦秸营养价值降低,温度升高对降解率影响最小,其次为CO₂浓度升高,温度和CO₂浓度同时升高对麦秸营养价值的影响最为显著。

Abstract: This experiment was conducted to investigate the effects of increasing atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw. The experiment consisted of a control group (wheat plants grown with a mean temperature of 10.5 ℃ and a CO₂ concentration of 413 μmol/mol) and three treatments: elevated CO₂ (CO₂ group, wheat plants grown with a CO₂ concentration of 500 μmol/mol); an elevated temperature group (TEM group, wheat plants grown under a 2 ℃ increase in temperature); and a CO₂ and temperature group (CO₂+TEM group, wheat plants grown with elevated temperature and CO₂ concentration). At harvest, the wheat straw was collected and the in situ degradability was monitored in three fistulated Holstein dairy cows. The results showed that the proportion of rapidly degraded dry matter (DM) was significantly greater in the TEM group than in the control group (P<0.05). The slowly degraded proportion and rumen degradability of acid detergent fiber (ADF) were significantly decreased in the TEM group compared with the control group (P<0.05). In the CO₂ group, the rumen degradability of DM, organic matter (OM), neutral detergent fiber (NDF), and ADF was significantly decreased (P<0.05), and the effective degradability of DM, OM, and NDF was significantly decreased also (P<0.05). In the CO₂+TEM group, the rumen degradability of DM, OM, NDF, and ADF was significantly decreased (P<0.05), and the slowly degraded proportion and the effective degradability of DM, OM, and ADF was significantly decreased also (P<0.05). The treatments were ranked, from highest rumen degradability of DM, OM, NDF, and ADF to lowest, as follows: control group>TEM group>CO₂ group>CO₂+TEM group. These results showed that increased temperature and CO₂ concentration significantly decreased the in situ degradation of DM, OM, NDF, and ADF, and resulted in decreased nutritional value of wheat straw. The lowest nutritional value of wheat straw was in the CO₂+TEM group.

何香玉, 慕春龙, 蔡旻, 吴艳萍, 杨宇翔, 毛胜勇, 成艳芬, 朱伟云. 不同温度和CO₂浓度生长环境下小麦麦秸的消化率研究[J]. 草业学报, 2016, 25(12): 111-118.

HE Xiang-Yu, MU Chun-Long, CAI Min, WU Yan-Ping, YANG Yu-Xiang, MAO Sheng-Yong, CHENG Yan-Fen, ZHU Wei-Yun. Effects of increased atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw[J]. Acta Prataculturae Sinica, 2016, 25(12): 111-118.

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不同温度和CO₂浓度生长环境下小麦麦秸的消化率研究

Effects of increased atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw

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