伐採で疎林になり日当たりがよくなるとササが増え、誰もが邪魔者に辟易するが、日本は雨が多く、山は急峻で地質がもろく、山はいたる所で崩壊する。実は、そんな山肌に繁茂して土砂をおさえているのがササ。長い年月がかかるが、樹々が育ち林床が暗くなるとやがてササは消えていく。自然のなかに存在するものは、すべて何らかの役割をもって存在しているようだ。
As deforestation leads to sparse forests and Improved sunlight, bamboo grass proliferates. Everyone regards it as a nuisance, yet Japan receives abundant rainfall, and with steep mountains and fragile geological formations, landslides occur frequently. In truth, bamboo grass thrives on these mountain slopes, anchoring soil and sediment. Over many years, as trees grow and the forest floor darkens, bamboo grass gradually fades away.
Everything existing in nature seems to have some role to play.