Journal of Food, Agriculture and Environment

Phosphorus fractions and soil release in alternately waterlogged and drained environments at the water-fluctuation-zone of the Three Gorges Reservoir

Author(s):

Limin Ma *, Duolikun Rena, Ming Zhang, Jianfu Zhao

Recieved Date: 2010-06-18, Accepted Date: 2010-10-29

Abstract:

The Water-Fluctuation-Zone (WFZ) of the Three Gorges Reservoir (TGR) has a special combination of aquatic and terrestrial ecological systems that are exposed to human activity. In this work, three kinds of soil were sampled along the Yangzi River in the TGR-WFZ. Our study focused on phosphorus (P) sorption characteristics and the change in inorganic P fractions for soils in alternately waterlogged and drained environments in the TGR-WFZ. Experiments were carried out to assess P sorption capacities and their relation to chemical properties in different soils. Concentration changes for different P fractions (e.g. Ca₂-P, Ca₈-P, Al-P, Fe-P, O-P and Ca₁₀-P) in soils were investigated to study P sorption and desorption characteristics in the soil and to assess effective factors in alternately waterlogged and drained environments. Results showed that, for different soil types, the maximum P-sorption capacities (Q_m) had the following order: yellow earth>purple soil>fluvo-aquic soil. Under cyclic waterlogged and drained conditions, the Q_m of waterlogged soil was higher than for drained soil. There was a decreasing trend for Olsen-P concentrations in soils after each draining process. The concentration of Ca₁₀-P in purple, yellow and fluvo-aquic soil increased from 31.3%, 40.0% and 42.6% (before inundating) to 38.7%, 48.9% and 51.5%, respectively, after three inundating-draining processes. The percent of stable fractions in soils increased after the inundating-draining process. Total P levels for all types of fractions decreased after every inundating-draining process. This suggests the existence of a P release trend from WFZ soils into the TGR water body, making P in soils a potential threat toward water eutrophication in the TGR.

Keywords:

Three Gorges Reservoir, water fluctuation zone, P fractions, phosphorus release

---

Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Environment
Pages: 1329-1335

---

Full text for Subscribers

---

Information:

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

---

Purchase this Article:   20 Purchase PDF Order Reprints for 15

---

Share this article :