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See more from this Division: S11 Soils & Environmental Quality
See more from this Session: Emissions of Atmospheric Pollutants and Carbon Sequestration: I (includes Graduate Student Competition)
Monday, 6 October 2008: 2:15 PM
George R. Brown Convention Center, 361AB
Abstract:
ÿþI n c r e a s i n g c a r b o n ( C ) r e t e n t i o n i n s o i l i s i m p o r t a n t , b e c a u s e S O M i s a b i n d i n g a g e n t f o r s o i l s t r u c t u r e , r e s e r v o i r f o r p l a n t n u t r i e n t s , a n d a m a j o r r e p o s i t o r y o f o r g a n i c C ( O C ) p o o l t o m i t i g a t e i n c r e a s e i n a t m o s p h e r i c a b u n d a n c e o f c a r b o n d i o x i d e ( C O 2 ) . A p p l i c a t i o n o f o r g a n i c a m e n d m e n t s ( O A ) c o u l d i n c r e a s e t h e S O M p o o l . T h u s , t w o O A [ i . e . w h e a t s t r a w ( W S ) d" 2 - m m l e n g t h a n d c a t t l e m a n u r e ( C M ) e a c h @ z e r o ( c o n t r o l ) , 4 , 8 , a n d 1 6 M g h a - 1 , r e s p e c t i v e l y ] a n d p o l y a c r y l a m i d e ( P A M ) [ @ z e r o ( c o n t r o l ) a n d 2 0 k g h a - 1 ] w e r e m i x e d t h o r o u g h l y w i t h a f i n e , m i x e d , m e s i c , A e r i c O c h r a q u a l f s i l t l o a m s o i l f r o m C o l u m b u s , O h i o . T h i s m i x t u r e o f s o i l - O A - P A M w a s i n c u b a t e d f o r 8 0 d a y s t o a s s e s i m p a c t o n t e n s i l e s t r e n g t h ( T S ) , s o i l m o i s t u r e r e t e n t i o n ( 0 t o - 3 3 3 k P a ) , a g g r e g a t e s t a b i l i t y ( A S ) , m e a n w e i g h t d i a m e t e r ( M W D ) , g e o m e t r i c m e a n d i a m e t e r ( G M D ) , w e t t a b i l i t y ( W A ) , a n d k i n e t i c e n e r g y ( K E ) r e q u i r e d b r e a k i n g t h e a g g r e g a t e s . B o t h C a n d N m i n e r a l i z a t i o n w e r e a l s o d e t e r m i n e d . T h e W S , C M , P A M , a n d t h e i r i n t e r a c t i o n s [ ( C M x W S ) , ( C M x P A M ) , a n d W S x P A M ) ] s i g n i f i c a n t l y ( P d" 0 . 0 5 ) i n f l u e n c e d A S , M W D , T S , W A a n d K E , i n d i c a t i n g i m p r o v e m e n t i n s o i l s t r u c t u r e . H o w e v e r , t h e e f f e c t o f W S x C M x P A M i n t e r a c t i o n w a s n o n - s i g n i f i c a n t o n a l l t h e s e s o i l q u a l i t y p a r a m e t e r s . O r g a n i c a m e n d m e n t s s i g n i f i c a n t l y ( P d" 0 . 0 5 ) i n c r e a s e d t h e O C a n d N c o n t e n t s . H o w e v e r , t h e i m p a c t o f P A M o n O C a n d N c o n t e n t s w a s n o n - s i g n i f i c a n t . F u r t h e r , P A M s i g n i f i c a n t l y ( P d" 0 . 0 5 ) d e p r e s s e d t h e C O 2 e v o l u t i o n . F i e l d e x p e r i m e n t s a r e n e e d e d t o a s s e s s t h e i m p a c t o f O A o n s o i l q u a l i t y , a g r o n o m i c p r o d u c t i v i t y , e n v i r o n m e n t q u a l i t y a n d o t h e r e c o s y s t e m s e r v i c e s .
See more from this Division: S11 Soils & Environmental Quality
See more from this Session: Emissions of Atmospheric Pollutants and Carbon Sequestration: I (includes Graduate Student Competition)