J. Jpn. Soc. Soil Phys. No. 33, p.2/ 3.,**/ * * * ** Neutralization E#ects of Acidity of Rain by Cover Plants on Slope Land Tadashi ADACHI*, Yoko OKI*, Akihiro NAGAI* and Shogo NAKATSUKASA** * Faculty of Environmental Science and Technology, Okayama University ** The Graduate School of Natural Science and Technology, Okayama University, - + + Tsushima-naka, Okayama, 1** 2/-* Japan Abstract Neutralization e#ects of acidity of rain were examined by cover plants on slope land. Slope gradient was +* degrees. Cynodon dactylon Pers, Dichondra repens Forst and Artemisia princes Pampan were selected as cover plants. The ph value of rain less than ph /.0 was observed +* times among +- times of sampling, and it was ranged from..-3 to /.3,. The main results of this experiment were as follows : The ph value of surface runo# increased than that of each rain. The average value of [H ] of surface runo# was a value from which.1 of [H ] of rain was subtracted. This means that cover plants have the neutralization e#ects of acid rain. The neutralization capability of acid rain was explained that cation leached from the leaf parts of cover plants has played the role of counteractive. There was the di#erence in the ph value of surface runo# between Atremisa princes and Cynodon dactylon. Therefore it was shown that the neutralization e#ects of acid rain of Atremisa princes was larger than that of Cynodon dactylon. Key words : cover plants, acid rain, neutralization e#ects, Electric Conductivity, Potassium ion, Artemisia princeps Pampan + +33, ;,** Afandi et al.,,** ph +331 ph * 1** 2/-* - + + ** 1** 2/-* - + + :
86 33,**/ + + + /.,* cm +* +* m,, m, / m, Cynodon dactylon Pers Dichondra repens Forst Artemisia princeps Pampan - +333 0 +330 + Fig. + Schematic illustration of experimental plot.,**+ / 2* /* 1 2* 0 3. -* cm -, cm +* cm ph +,** ml,**+ /,- ++ - +-. /B ph H,O HORIBA ph/ion METER F-,- EC HORIBA CONDUCTIVITY METER DS-+. EC K, Na, Ca, Mg, Zn, Fe SO., NO -, Cl HitachiZ-0+** HitachiD-1/** - -
: 87 - ph EC, ph..-3 /.3, H ph..32 ph /.0 +- +* ph +33- ph ph /.0 EC ph, ph /..0 R, *.3,-. ph EC +32/ - ph, - a ph Na K Na K ph - b SO. Cl NO - ph SO. ph NO - SO. Cl Na Na ph Cl Na +.,+ +.+1 +33* SO. 0* 22 ph SO. +33. SO. Fig.,, ph EC Relations between ph and EC of rain. - ph Fig. - Relations between ph and cations or anions of rain.
88 33,**/.. + ph. a ph ph ph + : + ph. b ph H H H H *.+ / EC Fig. / EC ratio of rain to surface runo# from cover plant plots (ave. *.0.).. ph H Fig.. The ph or H comparison between rain and surface runo# from cover plant plots. 0 Fig. 0 Ion concentration ratio of rain to surface runo# from cover plant plots.
: 89 +.*1 *./- H.1.,. + EC / EC ph EC +.+ *.,1 *.0. -0., / EC ph 0 a b *.0. *.02 1 2 ph K *.3. Ca *.1+ Na *../ Mg +.,- 0 a Fig. 1 1 Cation concentration ratio of rain to surface runo# from cover plant plots.
90 33,**/ 2 a b SO. NO - *.22 *.3+ c Cl *..* 3 H Fig. 3 Comparison of H ratio of surface runo# between bare plot and cover plant plot (ave. *.3-). 2 Fig. 2 Anion concentration ratio of rain to surface runo# from cover plant plots. +* Fig. +* Comparison of cation and anion concentration ratio of surface runo# between bare plot and cover plant plot.
: 91 +312 ph Takamatsu +331 / 3 H ph + *.+3 +.20 H H *.3- H 1 +* +..2 +.*+ ++ Fig. ++ ++ Comparison of cation concentration ratio of surface runo# between bare plot and cover plant plot.
92 33,**/ +, ph ++ Ca Na +.*1 +.++ K Mg -.+* +.02 K +, +.+/ SO. NO - *.3. +.*+ +, 0* cm * / cm ph /.2* ph 0.++ 0.,3 0 H +- H H H +.20 *.,/ *.23 ++ +. +/ ph Ca Na SO. NO - +, Fig. +, Comparison of anion concentration ratio of surface runo# between bare plot and cover plant plot. +- Fig. +- H The H ratio comparison of surface runo# between Artemisia plot and Cynodon plot (ave. *./3).
: 93 Fig. +. +. Comparison of cation concetration ratio of surface runo# between Artemisia plot and Cynodon plot. Mg K,.+3 K. H 3* ph..2- ph /.2-1 +- +* ph H.1 EC K
94 33,**/ +/ Fig. +/ Comparison of anion concetration ratio of surface runo# between Artemisia plot and Cynodon plot. +33 : +/ p. -3,** : +. p. +*2. Afandi, T., Manik, K., Rosadi, B., Utomo, M., Senge, M., Adachi, T. and Oki, Y. (,**,) : Soil Erosion under Co#ee Trees with Di#erent Weed Managements in Humid Tropical Hilly Area of Lampung, South Sumatra, Indonesia, J. Jpn.Soc.Soil Phys., 3+ : - +.. Afandi, T., Rosadi, B., Maryanto, Nurarifani, Utomo, M., Senge, M. and Adachi, T. (,**,) : Sediment Yield from Various Land Use Practices in a Hilly Tropical Area of Lampung Region, South Sumatra, Indonesia, J. Jpn. Soc. Soil Phys., 3+ :,/ -2. +331 : : +* / :.0-.10. +33- : + 0.. :..2.//. +32/ : +. : +-+.0. +33* :,/ : +// +0,. +33. : 0/ - : -+- -,*. T. Takamatsu, Kohno, T., Ishida, K., Sase, H., Yoshida, T. and Morishita, T. (+331) : Role of the dwarf bamboo (Sssa) community in retaining basic cations in soil and preventing soil acidification in mountainous areas of Japan, Plant and Soil, +3, : +01 +13. +312 : -. + :,- -*. :,**. 3,2 :,**/, +