野生杜鹃林土壤低分子量有机酸分布特征

doi:10.11707/j.1001-7488.20210803

Abstract

Abstract:

Objective: This paper aims to explore the distribution characteristics of organic acids in the soil from different stands in Guizhou Baili Rhododendron National Forest Park, in order to provide technical strategies for the soil management of wild rhododendron stand. Method: The topsoil of R. delavayi evergreen mixed forest, R. irroratum evergreen mixed forest, R. agastum evergreen mixed forest, evergreen broad-leaved mixed forest, and deciduous broad-leaved mixed forest were collected, and the contents of organic acids (oxalic acid, tartaric acid, formic acid, malic acid, lactic acid, acetic acid, citric acid, succinic acid) were determined by high performance liquid chromatography (HPLC). Result: The distribution of total content of organic acids in different stand types was as follows: deciduous broad-leaved mixed forest>R. irroratum evergreen mixed forest>R. delavayi evergreen mixed forest > evergreen broad-leaved mixed forest>R. agastum evergreen mixed forest; There were significant differences in soil organic acids among different stand types. The order of organic acid contents was oxalic acid > tartaric acid > citric acid > malic acid > lactic acid > acetic acid > formic acid > succinic acid. Oxalic acid is the dominant acid, and the contents of acetic acid, formic acid and succinic acid were relatively low; There was a negative correlation between soil organic acids and pH, among which tartaric acid was highly significantly negatively correlated with pH, and citric acid was significantly negatively correlated with pH; The clustering results showed that the deciduous broad-leaved mixed forest was obviously different from other stand types, and the oxalic acid content was the highest. Conclusion: The distribution of soil organic acids in different stand types is affected by dominant species. The content of soil organic acid in deciduous broad-leaved mixed forest is much higher than that of evergreen broad-leaved mixed forest and rhododendron evergreen mixed forest in Baili Rhododendron National Forest Park. The distribution characteristics of organic acids in forest soils should be the focus of stand management.

Key words: Rhododendron, natural forest, organic acids, dominant species, stand type

CLC Number:

S714.2

Tayan Xu,Wenxuan Quan,Chaochan Li,Yannan Pan,Lijuan Xie,Jiangtao Hao,Yongdao Gao. Distribution Characteristics of Low Molecular Weight Organic Acids in Soil of Wild Rhododendron Forest[J]. Scientia Silvae Sinicae, 2021, 57(8): 24-32.

Figures/Tables 5

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References 0

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林分样地基本情况 General situation of stand plot	常绿混交马缨杜鹃林 Evergreen mixed forest of R. delavayi	常绿混交迷人杜鹃林 Evergreen mixed forest of R. agastum	常绿混交露珠杜鹃林 Evergreen mixed forest of R.irroratum	常绿阔叶混交林 Evergreen broad-leaved mixed forest	落叶阔叶混交林 Deciduous broad-leaved mixed forest
杜鹃幼苗数量 Number of seedlings	1	0	1	3	23
枯落物厚度 Litter thickness/cm	8	10	9	6	2
腐殖质厚度 Humus thickness/cm	4	4	3	2	0.8
土壤pH Soil pH	4.11	4.83	4.72	5.32	5.63
土壤温度 Soil temperature/℃	17	16	15	15	19
坡位Slope position	中Middle	上Up	上Up	上Up	中Middle
坡向Aspect	西南Southwest	西南Southwest	北North	北North	南South
坡度Slope	11°	23°	15°	15°	15°
光照度Illumination/lx	20	30	66	260	171
湿度Humidity(%)	68.4	62.5	62.2	65.3	51.2
树种株数比(杜鹃∶乔木∶灌木) Number of tree species composition(rhododendron∶tree∶shrub)	52∶5∶4	59∶5∶10	55∶7∶8	50∶13∶12	0∶43∶42
杜鹃相对盖度 Rhododendron relative coverage(%)	85	87	80	52	0

	酒石酸 Tartaric acid	甲酸 Formic acid	苹果酸 Malic acid	乳酸 Lactic acid	乙酸 Acetic acid	柠檬酸 Citric acid	丁二酸 Succinic acid	pH	相对含水量 Relative water content
草酸Oxalic acid	-0.587	-0.271	0.965^**	-0.226	0.907^*	-0.332	0.131	0.530	-0.894^*
酒石酸Tartaric acid		0.662	-0.670	0.498	-0.811	0.955^*	0.486	-0.984^**	0.555
甲酸Formic acid			-0.245	0.870	-0.559	0.691	-0.017	-0.542	0.378
苹果酸Malic acid				-0.272	0.939^*	-0.419	-0.115	0.649	-0.770
乳酸Lactic acid					-0.555	0.471	0.084	-0.408	0.128
乙酸Acetic acid						-0.609	-0.131	0.757	-0.759
柠檬酸Citric acid							0.555	-0.946^*	0.376
丁二酸Succinic acid								-0.624	-0.355
pH									-0.456

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Distribution Characteristics of Low Molecular Weight Organic Acids in Soil of Wild Rhododendron Forest

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