In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主要组成的木质素、全纤维素、聚戊醣等成，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高纬地区的白桦，可以降低灰、抽出物、木素含量，提高综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

同为化学主要组成分的木质素、全纤维素、聚戊醣等成分，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高经纬地区的白桦，可以降低灰分、抽出物、木素含量，提高综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至化学主要组成的木质素、全纤维素、聚戊醣等成，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高经纬地区的白桦，可以降低灰、抽出物、木素含量，提高综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主要组成分木质素、全纤维素、聚戊醣等成分，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较白桦，可以降低灰分、抽出物、木素含量，提综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主要组成的木质素、全纤维素、聚戊醣等成，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高纬地区的白桦，可以降低灰、抽出物、木素含量，提高综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主要组成分的质、全纤维、聚戊醣等成分，有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高经纬地区的白桦，可以降低灰分、抽出、含量，提高综纤维和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主要组成的木质素、全纤维素、聚戊醣等成，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高纬地区的白桦，可以降低灰、抽出物、木素含量，提高综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主要组成分的木质素、全纤维素、聚戊醣等成分，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，高经纬地区的，以降低灰分、抽出物、木素含量，提高综纤维素和聚戊糖含量。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

至于同为化学主分的木质素、全纤维素、聚戊醣等分，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表，选择较高经纬地区的白桦，可降低灰分、抽出物、木素含量，提高综纤维素和聚戊糖含量。