Environmental Engineering Reference
In-Depth Information
18
Origin of Paddy Fields and Functions
for Environmental Remediation in the
Urbanized A
reas of Yangtze River Delta
ZhihongCao
CONTENTS
Introduction.......................................................................................................... 394
Origin.of.Irrigated.Rice.Paddy.Fields.and.Chinese.Paddy.Soils.................. 396
Evidence.for.Rice.Paddy.Soils'.Sustainability................................................. 398
Rice.Paddy.Fields.Located.at.the.Loujiajiao.Site.Are.
More.Than.3000.Years.Old..................................................................................398
Productivity.Increased.as.Rice.Cultivation.Was.Prolonged.within.
the.Paddy.Soil.Chronosequence................................................................... 400
Ecological.Functions.of.Rice.Paddy.Fields...................................................... 401
Sequestrate.More.Carbon.............................................................................. 401
Mutual.Contention.between.Methane.and.NO
2
.Emissions...................... 402
Coping.with.Disasters.of.Flooding.and.Water.Lodging........................... 403
Water.and.Soil.Conservation.and.Prevention.of.Nonpoint.Pollution......... 405
Treatment.of.Domestic.Wastewater.............................................................. 407
Remediation.of.Organic.and.Inorganic.Pollutants.in.Soil........................ 408
Other.Beneits.for.the.Environmental.Protection.
of.Urbanized.Regions................................................................................... 409
Groundwater.Supplementation.in.Preventing.Land.Subsidence....... 409
Minimizing.the.Heat.Island.Effect.for.Urban.and.Rural.Areas........... 410
Biodiversity.System.and.Clean.Air.......................................................... 410
Summary............................................................................................................... 411
Acknowledgments............................................................................................... 411
References............................................................................................................. 412
393
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