|Table of Contents|

Soil Nutrients Distribution in the Small Catchment andTheir Effects on the Eutrophication of Dianchi Lake(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2017年04期
Page:
129-
Research Field:
·地理学·
Publishing date:

Info

Title:
Soil Nutrients Distribution in the Small Catchment andTheir Effects on the Eutrophication of Dianchi Lake
Author(s):
Liu Yuping1; Chen Xi1; Wang Yanhua1; 2; Yang Hao1; 2; Zhang Mingli1; Xie Biao1; Cui Jun1
(1.School of Geography Science,Nanjing Normal University,Nanjing 210023,China)(2.Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control,Nanjing 210023,China)
Keywords:
Dianchi lake; small catchment; nutrient; land use; ecological risk
PACS:
X53
DOI:
10.3969/j.issn.1001-4616.2017.04.021
Abstract:
In this paper,three types of land uses including abandoned land,forestland and grassland in the Songhuaba catchment(SHB)and the Shangyou catchment(SY)of the Dianchi watershed were investigated to determine the effects of land use on soil nutrients. Contents of total nitrogen(TN),total phosphorus(TP)and total organic carbon(TOC)in the soil samples were measured to compare the differences between three types of land uses in two catchments. Nutrients pollution and the risk of eutrophication was in discussion as well. Results are as follows:(1)In the SHB catchment,the highest contents of TOC(16.88 mg/g),TN(1.77 mg/g)and TP(0.42 mg/g)were observed in the grassland. TOC content in the forestland was higher than that in the abandoned land. While the difference of TN and TP contents between the forestland and grassland was not obvious.(2)In the SY catchment,the similar distribution was found. The contents of TOC,TN and TP were highest in the grassland and lowest in the abandoned land. Not obvious difference of TN and TP contents in three types of land uses were observed.(3)Comparing the soil profile,TOC,TN and TP contents in the layer of 0-20 cm soil were much higher than those in the layer of 20-40 cm in both catchments. The TOC,TN and TP contents in the surface soil of the grassland is much higher than those in the abandoned land.(4)The TN standard index of three types of land uses was beyond the safe line,reflecting high eutrophication potential. The key measure will be the control of nitrogen inputs in the small catchment. OI and TP standard indexes in the abandoned land were lower than those in the forestland and grassland. Three standard indexes in the layer of 0-20 cm soil are relatively high,indicating ecological risks.

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Last Update: 2017-12-30