{"id":55678,"date":"2025-08-26T23:00:58","date_gmt":"2025-08-26T14:00:58","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/%e7%8f%be%e5%a0%b4%e3%81%ae%e6%a4%8d%e7%89%a9%e3%82%92%e8%a6%8b%e3%82%8b%e3%81%a8%e3%81%9d%e3%81%ae%e5%9c%b0%e5%bd%a2%e3%82%84%e4%bf%9d%e6%b0%b4%e7%8a%b6%e6%85%8b%e3%81%8c%e3%82%88%e3%81%8f%e5%88%86\/"},"modified":"2026-05-16T16:07:15","modified_gmt":"2026-05-16T07:07:15","slug":"plants-indicate-terrain-and-water","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/plants-show-terrain-water\/","title":{"rendered":"Looking at the plants on site gives you a good sense of the terrain and soil moisture conditions. A prime example is bamboo!"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

When I go out to inspect slopes, the thing I pay attention to is bamboo.<\/p>\n

Well, it's not just bamboo, but you can get a rough idea of the soil conditions based on the plants growing there.<\/p>\n

\"Bamboo<\/p>\n

\"Bamboo groves = a sign of surface water retention\"
\"Willows and alders = signs of valley bottoms and high groundwater levels\"
\"Reeds and sedges = a sign that water is pooling on the ground\"<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Types of Plants<\/th>\nTypical Examples<\/th>\nAn easily accessible location<\/th>\nWhat this means<\/th>\n<\/tr>\n<\/thead>\n
Bamboo Species<\/strong><\/td>\nMoso bamboo, Madake bamboo<\/td>\nValley bottoms, foothills, and damp slopes<\/td>\nThe topsoil is moist, and the roots extend to a depth of about 1 to 2 meters.<\/td>\n<\/tr>\n
Willow Species<\/strong><\/td>\nWeeping Willow, Mud Willow<\/td>\nAlong rivers and streams<\/td>\nTerrain with a high groundwater level where water tends to pool<\/td>\n<\/tr>\n
Alder<\/strong><\/td>\nAlder<\/td>\nWetland forest, former rice paddy<\/td>\nIndicates a wetland or poorly drained area<\/td>\n<\/tr>\n
Yoshi (Reed)<\/strong><\/td>\nOkay<\/td>\nMarshes, riverbanks<\/td>\nSigns of standing water on the surface<\/td>\n<\/tr>\n
Sedges<\/strong><\/td>\nCyperaceae family, genus Cyperus<\/td>\nRice paddy ridges, damp lowlands<\/td>\nAn environment where the ground is constantly damp<\/td>\n<\/tr>\n
Apiaceae<\/strong><\/td>\nSerri<\/td>\nAlong the waterway, in the wet fields<\/td>\nEvidence that clear water is springing forth<\/td>\n<\/tr>\n
Zenmai and Warabi<\/strong><\/td>\nWild vegetables<\/td>\nValley bottoms, damp slopes<\/td>\nMoist Areas and Water-Retentive Mountainous Regions<\/td>\n<\/tr>\n
Tokusa<\/strong><\/td>\nTokusa<\/td>\nAlong the river, on damp sandy ground<\/td>\nReflects the groundwater level<\/td>\n<\/tr>\n
Frogs<\/strong><\/td>\nDwarf Cattail, Cattail<\/td>\nPonds and Waterfronts<\/td>\nIndicates a harsh wetland environment<\/td>\n<\/tr>\n
Other<\/strong><\/td>\nDokuzeri, Mitsugashiwa<\/td>\nWetland<\/td>\nIndicator Plants for Wetlands<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

*This is for reference only.<\/p>\n

\n

What We Can Learn from a Bamboo Grove<\/h1>\n

1. Characteristics of the Soil Environment<\/h2>\n
    \n
  • \n

    Soil with a high water content<\/strong>
    Bamboo requires large amounts of water to grow. Therefore, areas where bamboo groves are found often have a relatively high water table and moist soil that easily retains rainwater.<\/p>\n<\/li>\n

  • \n

    Water retention is concentrated in the surface layer<\/strong>
    Bamboo roots (rhizomes) tend to spread horizontally, but they generally grow to a depth of about 1 to 2 meters. As a result, they rely heavily on moisture in the topsoil, indicating that the soil near the surface has high water-holding capacity.<\/p>\n<\/li>\n<\/ul>\n

    2. Ground Stability and Risk<\/h2>\n
      \n
    • \n

      Surface Compaction<\/strong>
      Because the roots spread out shallowly, they help stabilize the soil surface to some extent and prevent topsoil erosion.<\/p>\n<\/li>\n

    • \n

      Deep Instability<\/strong>
      Conversely, since roots cannot reach depths greater than 2 meters, this method is largely ineffective in controlling groundwater flow or preventing ground collapse in deeper layers. Special care must be taken to ensure slope stability.<\/p>\n<\/li>\n<\/ul>\n

      \"Gravity<\/p>\n

      3. What construction method should we consider?<\/h2>\n
        \n
      • \n

        Drainage and Water Removal Measures Are Important<\/strong>
        Since water tends to pool on the surface, I believe that borehole drainage will always be necessary for retaining wall and slope stabilization projects.<\/p>\n<\/li>\n

      • \n

        Understand the depth of the roots before beginning construction<\/strong>
        When driving anchors or piles, it is important to take into account the \u201ccompaction at the ground surface\u201d and \u201cweakness at depth\u201d by referring to the depth at which bamboo roots are distributed. If possible, cut down the bamboo and install bolts and drainage.<\/p>\n<\/li>\n<\/ul>\n

        \n

        Bamboo groves are a sign of \u201cmoist soil with a high water content near the surface,\u201d and since their roots are relatively shallow\u2014reaching only about 1 to 2 meters\u2014it can be said that \u201cwhile they contribute to the stability of the ground surface, they do not contribute to the stability of the deeper soil layers.\u201d<\/p>\n

        Therefore, when you see a bamboo grove, you can interpret it as indicating \u201cwaterlogged soil\u201d or \u201cbe mindful of stability at deeper levels.\u201d<\/p>\n

        If you look at the situation from that perspective, you\u2019ll be able to see it from a different angle.<\/p>\n

        Well, there are times when there\u2019s a bit of an artificial element to it, though lol<\/p>\n

         <\/p>\n

        See you later.<\/p>","protected":false},"excerpt":{"rendered":"

        Hello, everyone. This is Enta. When I go out to survey slopes, I pay special attention to the bamboo. Well, it\u2019s not just the bamboo\u2014but by looking at the plants growing there, I can get a rough idea of the soil conditions. \u201cBamboo groves = a sign of good surface water retention,\u201d \u201cwillows and alders = a sign of valley bottoms or high groundwater levels\u2026\u201d<\/p>","protected":false},"author":2,"featured_media":55341,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[34,43],"tags":[2735,2994,5340,5725,6967,6968],"class_list":["post-55678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-slope-work","category-issues","tag-2735","tag-2994","tag-5340","tag-5725","tag-6967","tag-6968"],"acf":[],"yoast_head":"\n\u73fe\u5834\u306e\u690d\u7269\u3092\u898b\u308b\u3068\u305d\u306e\u5730\u5f62\u3084\u4fdd\u6c34\u72b6\u614b\u304c\u3088\u304f\u5206\u304b\u308b\u3002\u4ee3\u8868\u7684\u306a\u30e2\u30ce\u306f\u7af9\u3060\uff01 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