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紫花苜蓿生长特性及品质对不同刈割强度的响应 被引量:3

Response of Quality and Growth Characteristics of Medicago sativa for the Different Intensity of Cutting
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摘要 以紫花苜蓿为试材,研究了紫花苜蓿生长特性和品质对刈割强度的响应。结果表明:轻度和中度刈割可提高紫花苜蓿株高和地上植株的再生能力;不同强度的刈割均增加了紫花苜蓿单株地上、地下生物量和根冠比(R/S),以中度刈割增加最为显著,重度刈割处理下紫花苜蓿补偿地上生物量最高;随刈割强度的增加紫花苜蓿叶片叶绿素a含量有所增加,叶绿素b含量有所下降,与刈割前相比,不同刈割强度均增加了紫花苜蓿叶绿素a和b含量,有利于增强紫花苜蓿的光合作用;重度刈割紫花苜蓿根系总长和平均直径显著降低(P〈0.05),而中度刈割紫花苜蓿根系总长和平均直径显著增加(P〈0.05);与刈割前相比,不同刈割强度均不同程度提升了紫花苜蓿根系活力;紫花苜蓿平均粗蛋白、粗脂肪、粗纤维、粗灰分和无氮浸出物均表现为中度刈割〉轻度刈割〉重度刈割〉不刈割(对照);综合各指标可得出荒漠草原区提高紫花苜蓿生长特性和品质的最优方案为中度刈割。 Taking Medicago sativa as material, the effect of different cutting intensities on the quality and growth characteristics of Medicago sativa were studied. The results showed that light cutting and moderate cutting could improve the ability of plant height and regeneration. Different intensities of cutting increased the aboveground, underground biomass and root cap ratio (R/S) of Medicago sativa ,moderate cutting increased most significant,and the compensatory aboveground biomass of high cutting was the highest. With the increase of the intensity of cutting, the content of chlorophyll a increased, chlorophyll b content decreased and different cutting intensities increased the content of chlorophyll a and b comparing to pre-cutting,which could be very helpful for photosynthesis of Medicago sativa. Heavy cutting lead to the total length and mean diameter of plant roots decreased significantly (P〈0. 05) ,and moderate cutting increased the total length and mean diameter of plant roots (P〈0. 05). Cutting also affected the activities of plant roots comparing to pre-cutting. The average crude protein,crude fat, crude fiber,crude ash and nitrogen free extract showed that moderate cutting〉light cuttingS〉heavy cutting〉control. Based on the comprehensive analysis of the indices, the optimum scheme for the quality and growth characteristics of Medicago sativa was proposed as moderate cutting in desert steppe.
作者 金文斌 张凡兵 JIN Wen-bin ,ZHANG Fan-bing (1. Training Offices of Armed Police in Beijing Forestry University,Beijing 100083;2. Key Lab for Silviculture and Conservation of Ministry of Education,College of Forestry,Beijing Forestry University,Beijing 100083)
出处 《北方园艺》 CAS 北大核心 2014年第21期72-77,共6页 Northern Horticulture
基金 北京林业大学科技创新计划资助项目(201304)
关键词 紫花苜蓿 刈割强度 生长特性 品质 Medicago sativa ; cutting intensity ; growth characteristics ; quality
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