Следующим требованием, предъявляемым к деревьям, является их конкурентоспособность. Продуктивность массива зависит от двух факторов: роста деревьев и плодородия почвы. Для достижения наибольшей продуктивности надо было бы занять всю поверхность отведенного участка. Однако деревьям необходимо определенное жизненное пространство как в воздухе, так и, что часто забывают, в почве, причем эти потребности изменяются с возрастом. Искусство лесовода заключается в том, чтобы в каждый период развития дерева дать ему пространство, достаточное для его нормального роста. В то же время лесовод должен ограничивать это пространство, чтобы наиболее эффективно использовать плодородие почвы. С помощью многочисленных вырубок деревья прореживают, оставляя самые крепкие и лучше других сформированные.

Правда, такие мероприятия дороги и продукция получается неоднородной. Этот метод неприменим в лесном древоводстве, которое предполагает выборочную вырубку, например для производства древесной массы, до окончательной вырубки. Таким образом, плантация должна быть с самого начала спланирована с учетом конечного результата, хотя это и влечет за собой потери в продуктивности в первые годы. Для уменьшения этих потерь выбираются наиболее конкурентоспособные виды и растения. Улучшение должно проводиться на четырех уровнях: вида, географической расы, семейства и, наконец, отдельной особи. В каждом данном месте число видов значительно изменилось за геологический период. В теплом и влажном климате флора стала разнообразной и возникло много видов. Во время экологических катаклизмов, таких, как оледенения в конце третичного и начале четвертичного периодов, часть видов на территории нынешней Франции была уничтожена; в то же время примерно на тех же широтах в других частях земного шара, в меньшей степени затронутых ледниками, флора сохранилась лучше. Современный климат Франции позволил бы хорошо расти многим вилам из числа исчезнувших в ледниковый период, если бы их можно было интродуцировать вновь. Некоторые из них более способны к росту и более продуктивны, чем наши самые мощные местные вилы.



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