Intercropping improves soil nutrient availability, soil enzyme activity and tea quantity and quality
Intercropping improves soil nutrient availability, soil enzyme activity and tea quantity and quality
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DOI：
10.1016/j.apsoil.2017.06.028
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发表时间：
2017-10-01
影响因子：
4.8
通讯作者：
Chen, Han Y. H.
中科院分区：
文献类型：
--
作者：
Ma, Yu-hua;Fu, Song-ling;Chen, Han Y. H.
间作是一项重要的农林复合技术，在世界范围内得到广泛应用。虽然间作增加土壤碳和氮，阐明其对土壤酶活性和产品的数量和质量的影响仍然是难以捉摸的。本文研究了板栗（Castanea mollissima Blume）与茶树（Camellia sinensis L.）土壤养分、土壤酶活性及茶叶产量和品质的季节动态。2011年5月、7月、9月和11月采集了0 - 20 cm（表土）和20-40 cm（底土）深度的土壤样品，并对2011年4月下旬至5月上旬采集的芽样进行了茶叶数量和质量检查。结果表明，间作对土壤养分和酶活性的影响与采样时间密切相关。土壤pH值和有机质，氮，磷，钾含量，以及土壤酶活性（过氧化氢酶，脲酶，脱氢酶，转化酶，多酚氧化酶）的平均增加间作，但是，效果更明显，在春季和初夏比夏末和秋季的大多数养分和酶活性。间作还通过降低氨基酸和儿茶素含量，增加茶氨酸和咖啡碱含量，增加茶叶的长度和重量，提高茶叶品质。结果表明，板栗遮荫提高了土壤养分的有效性，增强了土壤酶活性，有利于茶叶产量的增加和品质的改善。我们的研究结果表明，在茶园间作板栗树作为一种多样性处理，提高资源的可用性，生态系统功能，产品的数量和质量的农林复合生态系统。
Intercropping has long been an important agroforestry technique that has been applied worldwide. While intercropping increases soil carbon and nitrogen, an elucidation of its effects on the activities of soil enzymes and product quantity and quality remains elusive. Here we examined the effects of the intercropping of chestnut trees (Castanea mollissima Blume) in tea (Camellia sinensis L.) plantations on the seasonal dynamics of soil nutrients, soil enzyme activities, and tea quantity and quality in a temperate region in China. We collected soil samples from 0 to 20 cm (topsoil) and 20-40 cm (subsoil) depths in May, July, September, and November 2011, and examined the tea quantity and quality from bud samples collected in late April to early May 2011. We found that the effects of intercropping on soil nutrients and enzyme activities were strongly dependent on the sampling date. Soil pH and organic matter, nitrogen, phosphorus, and potassium content, as well as soil enzyme activities (catalase, urease, dehydrogenase, invertase, and polyphenol oxidase) increased on average with intercropping; however, the effects were more pronounced in the spring and early summer than late summer and fall for most nutrient and enzyme activities. Intercropping also increased the tea length and weight and tea quality by reducing the amino acid and catechin content, while increasing theanine and caffeine. Our analysis suggests that chestnut tree shading, enhanced soil nutrient availability, and the augmented activity of soil enzymes, facilitated the increase of tea quantity and the improvement of tea quality. Our results indicate that intercropping chestnut trees in tea plantations as a diversity treatment improves resource availability, ecosystem function, and product quantity and quality in the agroforestry ecosystems.