シカとササが表層土壌の水分動態に及ぼす影響 : 大台ケ原の事例  [in Japanese] Effects of sika deer and sasa on water potential in surface soil : A case study at Ohdaigahara  [in Japanese]

Access this Article

Author(s)

Abstract

大台ケ原において,シカ,ササの存在の有無を組み合わせた4つの実験小区でササが表層土壌の水分ポテンシャルに与える影響について検討した。ササの現存量はシカ除去・ササ放置区で最も大きかった。シカ侵入・ササ除去区では,春のササ除去後にササは再生するがその現存量は最も小さかった。地表面下6cm深のマトリック・ポテンシャルは,シカ除去・ササ放置区<シカ侵入・ササ除去区<シカ侵入・ササ放置区およびシカ排除・ササ除去区の順に低かった。シカ除去・ササ放置区でササの現存量が最も大きく降雨遮断によるマトリック・ポテンシャルの増加の遅れが認められた。また,この区の土壌は最も乾燥しており,ササによる蒸散の影響が大きいためと考えられた。シカ侵入・ササ除去区ではシカ除去・ササ放置区に次いで乾燥しており,ササ現存量が最も小さいために地表面蒸発が増大していると示唆された。ササの現存量が中庸であったシカ侵入・ササ放置区,シカ除去ササ除去区で最も湿った状態であり,表層土壌を湿潤に保つにはササが必要であることが示された。

We examined the effects of the dwarf bamboo sasa (Sasa nipponica) on the water potential of surface soil. We used 4 types of experimental plots in a forest at Ohdaigahara, in southern Honshu: with deer (Cervus nippon centralis) and either with or without sasa; and without deer and with or without sasa. The sasa biomass was highest in the plots without deer and with sasa. Although sasa grew back after sasa was cleared in spring, sasa biomass was lowest in the plots with deer and without sasa. At a depth of 6 cm, the matric potential was as follows: without deer and with sasa < with deer without sasa < with deer and sasa = without deer and sasa. In the plot without deer and with sasa, the matric potential increased slowly during periods of rain owing to rainfall interception by the large biomass of sasa that had built up as a result of deer exclusion. The soil was driest in this plot because of transpiration by the sasa. The next driest plot was that containing deer but no sasa; in this plot the minimum biomass of sasa led to an increase in evaporation from the surface. The matric potential was highest in the other 2 plots, which had intermediate sasa biomass. This finding suggests that a moderate biomass of sasa is needed to keep the surface soil moist.

Journal

  • Applied Forest Science

    Applied Forest Science 10(1), 31-36, 2001

    The Society of Applied Forest Science

Cited by:  8

Codes

  • NII Article ID (NAID)
    110009497649
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1342-9493
  • Data Source
    CJPref  NII-ELS  J-STAGE 
Page Top