毕节植烟区炭基有机肥施用适宜性区划研究
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作者单位:

1.江苏师范大学地理测绘与城乡规划学院;2.贵州省烟草公司毕节市公司;3.土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)

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基金项目:

贵州省烟草公司毕节市公司科技项目专项(2018520500240064)资助


Study on Suitability Zoning of Biochar-based Organic Fertilizer Application in Bijie Tobacco Growing Area
Author:
Affiliation:

1.School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou;2.Bijie branch of Guizhou Tobacco Company, Bijie;3.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences

Fund Project:

Supported by the Science and Technology Special Project of Bijie Tobacco Company of Guizhou Province in China (No. 2018520500240064)

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    摘要:

    炭基有机肥在改善土壤环境方面的作用越来越受到重视,不同土壤条件下炭基有机肥的施用分区研究对于区域土壤管理具有现实意义。选择贵州省毕节植烟区为案例区,在对其土壤pH和酸碱缓冲潜力空间分异特征研究的基础上,对该地区以改良酸化土壤为目的的炭基有机肥施用适宜性等级进行了区域划分。结果表明,毕节烟区全部采样点的pH均值为6.5,其中大方县、七星关区和威宁县的pH均值较低,分别仅为6.2、6.3和6.3,而织金县、金沙县和黔西县的pH均值超过了7.0,表现出较强的空间变异性;土壤酸碱缓冲潜力在各县区之间也存在较大差异,大方和威宁两县区的缓冲综合指数均仅为0.96,而织金县的缓冲综合指数达到了1.23。各成土母岩和土壤类型的pH和酸碱缓冲潜力的综合分级表明:砂岩、砂页岩和玄武岩土壤属于最适宜施用炭基有机肥来提升土壤pH的区域,其次为砂页岩紫色土,页岩黄壤、黄棕壤、紫色土,以及碳酸盐岩黄棕壤和黄壤,而碳酸盐岩粗骨土和石灰土则属于当前不适宜施用炭基有机肥提升pH的区域。毕节烟区的全部乡镇中,威宁、织金和赫章等县区的82个乡镇属于炭基有机肥重点施用乡镇,大方县和七星关区为主的144个乡镇属于一般施用乡镇,而黔西和金沙等县区中的32个乡镇属于当前不宜施用炭基有机肥的乡镇。研究结果不仅可对毕节烟区土壤的精准施肥和科学管理提供有益参考,也可丰富烟区土壤管理分区的研究成果。

    Abstract:

    【Objective】The role of biochar-based organic fertilizers in improving soil fertility and health, in general, has gained a lot of attention in recent times. It is the premise of scientific fertilization to make clear which planting areas are suitable for applying biochar-based organic fertilizer and which areas are not.【Method】Based on 2 059 soil samples in Bijie tobacco planting area of Guizhou Province, this study analyzed the distribution characteristics of soil pH and the spatial changes of soil properties, such as organic matter, available calcium, available magnesium, clay content and cation exchange capacity (CEC). Based on the overall consideration of soil pH and soil acid-base buffer potential, the suitability grade of biochar-based organic fertilizer application in the Bijie tobacco planting area was obtained. 【Result】The results showed that the average pH value of all sampling points in Bijie tobacco growing area was 6.5, which was weakly acidic. The average pH values of Dafang County, Qixingguan District and Weining County were only 6.2, 6.3 and 6.3, respectively, while those of Zhijin County, Jinsha County and Qianxi County were more than 7.0. The contents of organic matter, available calcium and magnesium, clay and CEC in tobacco planting soils in different counties were different, which led to the differences of soil acid-base buffer index between different counties. In all counties, the comprehensive index of acid buffer in Dafang and Weining was 0.96, while that in Zhijin was 1.23. Generally, there was a positive correlation between the pH value and the buffering potential of each parent rock soil type. The pH value of sandstone coarse bone soil and yellow soil was lower, and the value of the acid-base buffering potential index was also smaller. Also, the value of carbonate limestone soil with higher pH value was higher than that of other soil types. The suitability grade of biochar-based organic fertilizer calculated by pH value and acid-base buffer composite index showed that except for the purple soil of sand shale, the soil types derived from sandstone and sand shale were the most suitable application grade, and it was very necessary to apply a biochar-based organic fertilizer to improve soil pH value in these soil types. Carbonate and calcareous soils were not suitable for the application, which indicates that biochar-based organic fertilizer is not suitable for the two soil types without changing the current soil pH and acid-base buffer potential. The remaining soil types from other parent rocks belong to the suboptimal grade, and a certain amount of biochar-based organic fertilizer should be applied to these soil types to moderately increase the pH value, to keep the soil pH in a better state.【Conclusion】From the township level, the town numbers of key application, general application, and unsuitable application grades were 82, 144, and 32 respectively. The key application towns of biochar-based organic fertilizer were mainly concentrated in Weining County, Zhijin County, and Hezhang County. The towns with general application grade were more, and most of them were distributed in Dafang County and Qixingguan District. The unsuitable application towns for biochar-based organic fertilizer are mainly concentrated in Qianxi County and Jinsha County. This study fully considered the effects of soil pH value and acid-base buffer potential on the suitability of biochar-based organic fertilizer, and identified the key application, general application and unsuitable application towns in the Bijie tobacco planting area. This study provides a scientific basis for the accurate application of biochar-based organic fertilizer in the Bijie tobacco planting area and also enriches the research connotation of soil management division in the tobacco planting area.

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张忠启,彭华伟,王美艳,史学正,孙维侠.毕节植烟区炭基有机肥施用适宜性区划研究[J].土壤学报,2022,59(5). DOI:10.11766/trxb202011270652 ZHANG Zhongqi, PENG Huawei, WANG Meiyan, SHI Xuezheng, SUN Weixia. Study on Suitability Zoning of Biochar-based Organic Fertilizer Application in Bijie Tobacco Growing Area[J]. Acta Pedologica Sinica,2022,59(5).

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