Research Progress on Biochar Application for Continuous Cropping of TCM Plants
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摘要: 我国是中药材种植大国,但不合理的栽培方式和管理措施导致中药材连作障碍在种植区普遍存在,造成药材减产变质、道地产区转移、资源保护与利用不协调等,严重影响药用植物生长发育。因此对中药材连作土壤进行修复是解决中药材连作障碍的一个关键措施。生物质炭一般呈碱性,是一种良好的土壤改良剂,能够增加土壤养分、改良酸化土壤、提升植物品质,近年来得到广泛关注与应用,因此利用生物质炭作为调理剂来缓解中药材连作障碍具有一定潜力。本文针对我国中药材连作障碍的可能成因及潜在危害,分析生物质炭在解决药用植物连作造成的土壤理化性质改变、土壤微生物区系改变、化感自毒危害等问题上的作用,并对生物质炭在药用植物生产上的应用潜力进行展望。Abstract: As a major country in the world engaging in large-scale cultivation of traditional Chinese medicine (TCM) plants, China is facing a serious challenge in growth of the industry. Due to malpractices and poor management, undesirable consequences such as productivity decline and quality deterioration, relocation of authentic origins, insufficient resource protection, and uncoordinated material utilization have surfaced. The causes of the ill-effects may not be all clearly identified, nonetheless, rampant continuous cropping is deemed as one of the most urgent targets for correction. A generally alkali material, biochar is commonly applied to amend the soil in question to improve fertility, reduce acidification, and promote growth of the plants cultivated on it. It has been used by farmers in recent years, and the measure could be implemented to mitigate the damaging effects induced by the TCM continuous cropping as well. This article reviewed the benefits of biochar application on soil, such as adjusting the physiochemical properties, microbial community, and allelopathic environment. Some practical treatments for improvements are presented.
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表 1 相同热解条件下不同生产原料所制备生物质炭的性质
Table 1. Properties of biochar made from different raw materials by same pyrolysis process
原料
Raw material热解温度
Pyrolysis temperature/℃热解停留时间
Pyrolysis time/hpH 阳离子交换量
Cation exchange capacity/(cmol·kg−1)灰分
Ash/%文献来源
Literature小麦秸秆 Wheat straw 350 1 10.05 35.11 17.00 [70] 水稻秸秆 Rice straw 9.33 32.80 26.00 玉米秸秆 Corn straw 9.41 58.17 20.00 稻壳粉 Rice husk flour 450 9.07 73.17 26.26 [71] 花生壳 Peanut shell 8.72 91.94 29.98 牛粪 Cow dung 10.81 75.55 70.46 椰渣 Coconut residue 9.86 76.69 15.86 小麦秸秆 Wheat straw 10.08 33.60 28.00 [70] 水稻秸秆 Rice straw 10.13 27.10 29.00 玉米秸秆 Corn straw 9.92 43.33 23.00 小麦秸秆 Wheat straw 550 10.24 27.16 18.00 [70] 水稻秸秆 Rice straw 10.20 21.60 34.00 玉米秸秆 Corn straw 10.04 32.13 24.00 稻壳 Rice husk 0.5 8.1 — 51.2 [72] 玉米秸秆 Corn straw 10.13 — — [73] 水稻秸秆 Rice straw 500 3 10.30 — 28.46 [74] 油菜秸秆 Rapeseed straw 8.14 — — 玉米秸秆 Corn straw 600 1 10.30 128.25 36.27 [75] 紫茎泽兰 Eupatorium adenophorum 9.82 96.22 43.54 -
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